immediate power of these to affect us is quite clear. Emotion and attitudes are thought of as not understood until after the linguistic message has been determined. The impact of language on attitudes through persuasion is viewed by cognitive psychology and linguistics as occurring after the message has been understood. However, this does raise the question about whether a “message” (to be understood) is simply the linguistic properties of a sentence or the impact of the linguistic form on an audience. A very different view of language might come from considering vocal communications that often have a direct impact on an audience. Page | 69 Sometimes just listening to laughter compels listeners to laugh. Sometimes hearing a cry of terror directly imputes an instantaneous feeling of fear. Hearing someone weep can produce a feeling of sorrow and perhaps even cause one to cry. This suggests that some forms of vocal communication can elicit direct empathic sharing as Decety discusses in his chapter. These forms of vocal communication can produce direct results in listeners without following a route of symbolic reference and interpretation. 3 Language has typically been viewed as operating by the more symbolic route because of the linguistic claim that symbols are not the things they stand for and thus must be understood—words and sentences are not felt. However, the right insult or angry words delivered in the right way or the right praise seems to be felt directly, perhaps through the same kind of mechanisms by which empathic sharing occurs. But how is this achieved? This kind of impact of language is not a result of understanding the content of speech. It reflects social goals and motives. To the extent that this kind of social impact may parallel empathic processes, we might find that similar mechanisms are involved. Some kind of resonance must be established between a speaker and hearer, and language can serve to establish this resonance and lead to subsequent action by the hearer. This idea of a resonance in an audience does seem more compatible with the effects of vocal behavior such as laughter or crying on a listener than the symbolic interpretative view. This notion of resonance may also be useful in understanding other kinds of language impact from the fiery sermon of Edwards to the passionate speeches of Obama and Kennedy and King. In listening to speech that has impact, language has created a state in the listener that reflects the intention of the speaker. Whether it is fear or connection, somehow language can operate as the medium by which social and emotional psychological states get transmitted to an audience. But how does this impact get created in the social brain? Language impact in the social brain Understanding spoken language has typically been viewed as an analytic process in which sound patterns are translated into linguistic symbols by the brain. However, an alternative theory is that we understand spoken language by using our motor system to simulate what might have been said. The idea is that trying to mentally produce the speech internally (without talking) might help us understand what is said, when speech is not clear. However, this theory did not have much neural plausibility. People do not generally move their mouths overtly or even covertly while listening. The discovery of mirror neurons, examined at greater length by Steve Small in the next chapter, suggested one kind of mechanism that might instantiate this kind of process. In certain parts of the brain, involved in the control of action, some neurons that respond when making certain actions also respond when observing the same actions. This led to the inference that these neurons are involved in understanding the behavior of other people. The reasoning is simply that neural activity in the observer’s motor system that results when seeing a behavior essentially establishes the brain state that would Page | 70 correspond if the observer were doing the same thing. Another way to say this is that there is a resonant response in an observer’s motor system to observing a behavior and this may potentiate a degree of social coordination and connection, as discussed in Semin’s chapter. This kind of neural resonance has been shown to play a role in understanding speech when seeing a talker’s mouth move, even if the listener does not actually make any mouth movements. Mirror neurons demonstrate that observed action can produce a resonant response in an observer’s brain. Seeing a talker’s mouth move creates a motorresonant response that aids in understanding speech sounds. However, these two observations are very different from the idea that the meaning of sentences can create a resonant response in the listener’s brain. In the case of speech, mouth movements are the actions that create speech. This might seem like a very special case. The traditional linguistic view of language is that words and sentences are symbolic: Language describing action is not action itself. Language describing emotion is not the emotion itself. The entire concept of a symbol is that a symbol denotes something, stands for something, but the symbol is not the thing itself. But it now appears that this long-held notion may be wrong. The idea that seeing an object or event gives rise to brain states that resonate with previous experiences of that thing suggests a mechanism for language understanding to go beyond symbolic interpretation. Given that there is a brain mechanism for re-experiencing actions or sensations, this same mechanism may operate even when there is just a symbolic linguistic description. Understanding language may take place by invoking such resonant past experiences in the brain. For example, when listening to sentences about hockey action, hockey players show neural activity in their motor system which is not seen for people who are naïve to hockey. 4 Experience playing hockey recruits the motor system in service of understanding hockey sentences as if one were watching or playing hockey when only listening to speech. This suggests one way in which language can have a direct impact on a listener. Rather than making inferences about actions based on the meanings of sentences, understanding a sentence may be a resonant motor system response in the listener to a description of an action. If this idea is extended more broadly, language impact may come from such resonant responses. Language understanding and the impact of language may result from processes more similar to the effects of hearing laughter. Hearing a sentence may create in a listener a set of resonant responses very similar to the patterns that correspond to the actual situations being described. Such resonant responses need not be confined to the motor system and actions. Emotions such as fear or joy may be empathically evoked in listeners by speech just as a scream or laughter might. Verbal expression of attitudes may produce similar attitudinal responses in listeners. Moreover, if a listener’s resonant response is strong, there may be increased empathic overlap with the speaker, which may serve to increase social connection. To the extent that people speak together and share feelings, social connection may increase as well. Page | 71 Evolution of social connection by communication The human social brain constructs connection and understanding by anthropomorphic projection as discussed by Nick Epley in his chapter. When we observe the behavior of nonhuman entities, anthropomorphic projection may form a feeling of social connection. Social connection depends in part on empathic responses to observed action. It has been argued that this same foundation is the basis for the evolution of language as well--observed action may be the foundation for language. 5 A mirror neuron theory of the evolution of language starts with the assumption that we understand others by observing their actions. Communication depends on the regularization of typical actions that can be pantomimed. In principle this could lead to a kind of manual gestural system of communication akin to sign language. Hand and arm movements can depict a wide range of actions both by firstperson depiction of an action such as screwing the top onto a jar and by thirdperson depictions such as using the fingers to portray a person walking. Hand and arm postures can depict objects such as a cupped hand representing a bowl. Combining sequences of such object and action depictions can communicate relatively complex messages even without a formal language. This is a far cry from sign languages in which the mapping between hand shapes and movements is not visually transparent in this way. But as the pressure to communicate a broader range of messages increases, a manual gestural language would have to be modified to reflect more abstract symbols ultimately leading in the direction of a sign language. However, this kind of manual language has one major drawback. Communication depends on visual contact. In order to understand a gestural message it is necessary to see the hand movements. This limits the distances over which communication can take place. Moreover, a communication system that is effective for a group should not depend on face-to-face dyadic interaction, but allow for more broadcast communications. There is a great survival advantage in being able to maintain social connection and convey information over distances that go well beyond face-to-face communication. Many species of fish, amphibians, reptiles, birds, and mammals commonly exchange information at a distance through vocalizations. The learned songs (and some calls) of songbirds are particularly rich sources of information conveying, to the receiver, individual identity and a host of other characteristics of the sender. Some mammals exchange information at great distances through calling behavior. Humpback whale vocalizations are perceived over extremely long distances and may be used to maintain social groups at distances as great as 5 km. African elephants can recognize friends and relatives from their calls at a distance of 2.5 km. Human sheepherders keep each other company from the top of one mountain to another in the Canary Islands using a whistled language called Silbo Gomero. Whether for purposes of mating, threat, warning, or social organization, conveying information regarding location, identity and motivation, and directed at one individual or towards far-flung groups, Page | 72 vocal communication plays an important role in the social connection and behavior of a great number of vertebrate species. Thus while human vocal communication is enhanced substantially in face-to-face interaction, the evolution of speech has resulted in a system that can function even in the absence of direct visual observation. The sound of a threat or warning or distress can have substantial impact even at a distance from the speaker. Social impact and embodied language Many animals use vocalizations to maintain social group structure and to provide information relevant to a group. Even very young children use the way people speak as a marker of their social affiliation. 6 Such vocalizations are typically not viewed as symbolic forms that must be decoded and interpreted. Instead these vocalizations are mapped onto internal states more directly, much as human laughter may be. Although linguists and psychologists have often tried to differentiate human language from these kinds of vocalizations, language can impact us in much the same way. Perhaps language is less symbolic and more direct than scientists have thought. What does it mean for language to have impact? If we take laughter as our model, perhaps it means that language gives rise to responses that have a direct effect on our perceptual and motor systems. Sermons may terrify because they create worlds inside of the listener that seem real. We can see and hear torment and imagine the feelings of pain and suffering. This is not a symbolic interpretation but a real experience created from language. However, just as we can distinguish the pain we feel from the pain of others, even when we have strong empathic responses, we can distinguish such created experiences from those that occur in the real world. The stronger the language, the richer the imagery, the more intense the delivery, the more salient the mentally created experience. One impact of language may be to create real feelings and sensations, imagined movement and behavior. 7 When language hurts us through criticism, rejection or insult, it may do so by activating our experiences of real pain. When we are soothed by language, it may produce the same kind of endorphin effect that placebo treatments can invoke. When language binds us together, it may do so by creating the kind of shared emotional states that characterize empathy. In many respects, the linguistic view of language use does not engage these ways in which language functions. Linguistics treats language as consisting of patterns of symbols divorced from their origins in a human mouth, almost like print on a page rather than speech. But it is spoken language that the social brain evolved to use—print is a very modern invention which did not play any role in our evolution. In contrast, speech is produced from a coordinate action of muscles compressing lungs and moving tongue and jaw under the control of neurophysiology and hormones. Unlike the shape of printed letters, the sound of speech is shaped by attitude and emotion and intent, and its impact may be to transfer specific embodied states from the speaker to the listener. Conclusion Although physicists have debated the possibility of action at a distance for quite some time, the biological form of action at a distance is well established, Page | 73 achieved through vocal communication in an extremely broad range of behaviors and settings. The force of language is carried by the form, content, and delivery of a message. And the impact of this force may be created in the minds of an audience by the resonant invocation of past real experiences. Real pain and sorrow, real comfort and joy, real love and caring, are all part of our shared human experience. The impact of language may come by invoking resonant past experiences that can create a platonic mental moment that flickers with the shadows of those experiences. In order to understand how this process works, we need to study how brain mechanisms operate to translate the sounds of speech into the impact of language. References 1. Giles, H. (1973). Accent mobility: A model and some data. Anthropological Linguistics, 15, 87-105. 2. Lakin, J., & Chartrand, T.L. (2003). Using nonconscious behavioral mimicry to create affiliation and rapport. Psychological Science, 14, 334-339. 3. Foroni, F. & Semin, G. R. (2009). Language that puts you in touch with your bodily feelings. The multimodal responsiveness of affective expressions. Psychological Science, 20, 974-980. 4. Beilock, S. L., Lyons, I. M., Mattarella-Micke, A., Nusbaum, H. C., & Small, S. L. (2008). Sports experience changes the neural processing of action language. Proceedings of the National Academy of Sciences, 105, 13269-13272. 5. Rizzolatti, G., & Arbib, M.A. (1999). Language within our grasp. Trends in Neurosciences, 21, 188-194. 6. Kinzler, K. D., Shutts, K., Dejesus, J., & Spelke, E. S. (2009). Accent trumps race in guiding children’s social preferences. Social Cognition, 27, 623-634. 7. Shintel, H., & Nusbaum, H. C. (2007). The sound of motion in spoken language: Visual information conveyed by acoustic properties of speech. Cognition, 105, 681-690. Page | 74 Systems and Signals for Social Coordination How do we understand each other as people? Do we take people at their word, or do actions speak even louder? When moved to affiliate and to act in concert with other people as a group, we need to understand the communications and actions of others. Language can move us to action even across great distances but how does it do so? While we can observe the behavior of groups of people as coordinated, the mechanism of achieving this coordination is unseen. We may be driven socially to form groups but how does that drive function in the individual to cause us to cohere. In order to go beyond the observation and experiences we have with groups and group behavior, we need to understand what makes the engine of social connection run. At one level, we can talk about language as a force itself, as Howard Nusbaum does. We can talk about the synchronization of individual behavior as Gün Semin does. However, both of these are observations about the way individuals may become part of a group. To go beyond this we must look to our biology to understand how the machinery underneath our sociality leads to connected minds. Semin suggested one way our brains may seek to connect. Some neurons in an area of the brain that is involved in the control and planning of our actions also respond when we observe actions we have performed. Such neurons might be thought to “resonate” when seeing someone act or speak with our own experiences. Neurons that mirror actions and behavior have been thought to play a role in the process of understanding that behavior and the social connection that may form as a result of the resonance. In the next essay, Steve Small discusses these neural mechanisms and how they may be important in helping us understand spoken language and possibly in understanding social behavior. Page | 75 Chapter 8 8 8 The lead author is Steven L. Small, M.D., Ph.D., a Professor of Neurology and Psychology, Associate Chair for Research in Neurology, Member of the Committees on Neurobiology and Computational Neuroscience, and Senior Fellow, Computation Institute, at The University of Chicago. He is currently Director of the Human Neuroscience Laboratory and was founder of the Brain Research Imaging Center. He is an elected member of the American Neurological Association, a fellow of the American Academy of Neurology, and Editor-in-Chief of the international journal Brain and Language. Small’s research concerns the neural basis of human language and its breakdown after injury. He has published more than 120 scientific articles, primarily about human language, from the perspectives of artificial intelligence, cognitive psychology, computational neuroscience, human systems neuroscience, and clinical neurology. Human language represents a unique product of our social species and the tremendous evolution of the primate cerebral cortex simultaneously supported the development of both. Language is the defining feature of our species: In his 12 th century volume, Guide to the Perplexed, Maimonides viewed it as tautological that man is a speaking animal, i.e., “there is no third element besides life and speech in the definition of man”. But how does the brain implement this unique function in the context of its common ontogeny with social function? The current essay discusses the possibility that the recently discovered “mirror neurons” of the cerebral cortex of macaque monkeys play a special role in the ability of humans to understand each other with language by using a mechanism of observation and covert emulation. If the neurobiology of language were partly grounded on such systems of visual observation and imitation, this would overlap integrally with the biology of the social brain. Hidden Forces in Understanding Others: Mirror Neurons and Neurobiological Underpinnings It is one thing to perceive objects in the environment and another to understand what is perceived. A rodent that senses an apple definitely has a notion that this represents something edible. A monkey might realize that the apple can be eaten but also can be thrown. A human might perceive it as a food, an object to be propelled, a temptation that should be resisted, or something that falls out of a tree at a specific acceleration. For each individual animal or person, understanding an apple means to take the sensory perceptions of the apple and to use previous experience and knowledge to fit it into an overall context. In this way, understanding a particular apple depends on our previously having seen, touched, and smelled apples, eaten them, read about them, and perhaps even been hit by a falling or thrown apple. All of our previous experiences come to bear every time we encounter a new perception that we must make sense of, and of course, this represents virtually every moment of our waking lives. Our perceptions vary enormously from seeing simple objects (e.g., apples), taking in more complex entities (e.g., restaurants, neighborhoods), hearing noises or speech, and seeing actions (e.g., simple manual actions, sporting events). A major question for brain research is how we can possibly understand all these different kinds of input, and what brain circuits are used to do so. We assume that such an understanding means taking these inputs, weighing them against our previous Page | 76 experiences in some way or other, and then integrating in some way the new and old together. This integration requires constant and dynamic changes to the brain structures that represent what we know and how we use it. 1 One way this could happen is that when we perceive something new, we actually reenact in our mind’s eye the previous related perceptions. For example, if we encounter an apple – having encountered many previously -- perhaps we actually imagine (seeing) one or more previous apples or episodes involving apples, or imagine (performing) one or more instances of biting an apple or throwing one, and/or imagine tasting and smelling one. We might also imagine hearing the word “apple”, producing the sounds of the word, seeing the written form of the word, or even hearing, seeing, or producing synonyms or related words in our first (e.g., “Granny Smith”) or second (e.g., “pomme”) languages. We propose that understanding an apple is tantamount to executing this entire set of processes, and thus, that the circuits for understanding are very complicated and take up a large portion of the brain. Of course, not all of what we understand is directly available to the senses; we can clearly understand beliefs and emotions as well as physical objects and overt actions. Brain researchers generally take the view that previous experience guides understanding of abstract concepts in much the same way that it guides the understanding of the more concrete entities. For example, we can understand the emotional states of other people by imagining being in those states ourselves. When I see someone feeling happy or sad, I can evoke examples from my own previous experience of feeling happy or sad (perhaps even for the same reasons), and by feeling the emotion, I can understand it. The closer my previous experience is to the perceived one, the better the “understanding”. This principle holds whether one is trying to understand objects or people. An important distinction between people and objects when trying to understand their actions is that people, but not objects, have intentions. The Social Brain The critical question for neurobiologists is how does the brain understand. In particular, we want to know whether the same brain circuits that are used when we experience things personally are also used when we try to understand another person having the same experiences, whether these experiences are concrete, like grasping a cup or hitting a baseball, or more abstract like feeling sad or fearful or in pain. We also want to know whether understanding the simple concrete perceptions and these highly complex emotional states are mediated similarly in the brain. Further, we are interested in the overlap between conscious and unconscious understanding and shared or personal understanding. One way to address these questions is to examine the brain structures responsible for specific types of personal sensations, actions, and cognitive processes, and to see if these same ones play a role when individuals attempt to understand these functions in others. Using modern techniques of physiology, experiments of this type have been conducted in both monkeys and humans, with some surprising results. It is now possible to measure brain activity of humans while having a wide range of different kinds of experiences. Such human neuroimaging Page | 77 experiments have suggested that understanding actions and objects invoke some of the same brain structures used to perform the actions and to act on the objects. With respect to actions in particular, humans sometimes use their own motor repertoire in interpreting actions, possibly by imagining or mentally simulating the perceived action. When people are asked to observe the actions of others, particularly goal-directed actions involving the hands or mouth, they seem to activate brain regions for moving the hands or mouth. Thus, there is a link between observing actions and executing actions. This has a relevance to education as well: “Understanding by doing” (i.e., by observing and then executing) has a long and valued tradition in American education 2 , and these recent scientific results might help us understand why this is effective. When my son was 5 years old, he was a member of a kids’ soccer team in Hyde Park, on the campus of the University of Chicago. His coach was a professor of history at the university, a woman who had never played soccer, but was a voracious reader, and in her readings on the subject, took careful note of all the methods needed to play soccer as well as the rules and regulations. She methodically took the kids through all the (theoretically relevant motor) steps needed to dribble the ball, to pass, and to shoot – flex your foot this way, bend your leg that way, keep your arms this way, etc. The kids tried to follow the verbal instructions but their motor performance was less than stellar – they learned a little bit, but they lost all of their dozen games, for a depressing 0-12 record. The next season, the same team was coached by another volunteer parent, this time an engineer from Trinidad, who had played soccer his whole life. The instructions he gave the kids were quite different: “Follow me and do what I do”. There were no suggested foot flexions or extensions, and no specific leg movements proposed. The kids learned the skills, and won all their games. Why? The kids learned by observing a good model and then imitating what they observed the person doing, which appears to be a way to learn motor skills that is far stronger than that of explicit motor instruction. When people have strokes, a part of their brain dies, and they can lose the ability to speak or use a hand properly. We are now using this idea of imitation in a treatment program to re-educate people with strokes to use their hands better and to pronounce words better. For these imitation-based treatments, people first observe a particular hand action or speech sample on a video monitor, and then they try to produce it. In fact, they observe it over and over again for a while before they even try to do it at all. They are never told how to move their hands or mouths; they are just told to copy what they see. Over the course of six weeks, people with hand problems progress from imitating a simple grasp of a cup to picking up a telephone and dialing a number to picking up a toothbrush, brushing their teeth, and returning the brush to the sink. Those with speech problems progress from imitating simple words of a single syllable to longer less common words and even short phrases. We have already shown that these therapies have beneficial effects in a number of people and are now trying it out more extensively. There seems to be an important link between observing and executing actions. Similarly, there is a link Page | 78 between observing action and understanding emotion. This link has been most clearly demonstrated in the case of facial expressions – if I observe the muscles of the face in a position to convey an emotional state, clearly I perceive the emotion. What has been shown recently is that observing such facial expressions leads to two kinds of brain activations in the observer: The first set of regions activated are those that would be used by the observer to execute the identical face movements, just as with hand or mouth movements. However, additional regions are also active, and these are precisely the ones that would be involved if the observer were to feel the observed emotion personally. Thus the circuitry for action observation in the human brain is interdependent with parts of the brain critical for understanding more complex nuanced aspects of the world. Mirror Neurons It turns out that there may be cellular building blocks in the brain that are particularly important for observing and executing actions, and may ultimately lead to an explanation of action understanding and imitationbased learning. In fact, such structures would contribute to any form of understanding that could be partly explained by imagined re-enactment of perceived actions (e.g., seeing an emotional facial expression, hearing a cry of pain). The cells under discussion are a type of nerve cell, or neuron, discovered in the front part of the monkey brain by Professor Giacomo Rizzolatti and his colleagues at the University of Parma. The scientists trained monkeys to perform specific actions like grasping an object or licking their lips, and were performing electrical recordings in regions in the front of the brain known to coordinate movements. These recording machines note brain activity both visually, as a graph on a screen, and auditorily, by a loud series of clicks, indicating the firing of a neuron. Rizzolatti and his team were focusing on a particular region in the front of the brain, and were having the monkey perform all sorts of hand, mouth, and eye movements to see how the brain cells were organized to make these movements happen. One day (or so the story goes), one of the researchers returned from lunch while the electrical recordings were being made, and was finishing off a cone of superb Italian gelato, when all of a sudden the recording device starting making a loud series of clicks. The returning scientist stopped licking his ice cream cone to see what was going on, and the noise stopped. When he restarted licking his gelato, the clicks resumed, and when he stopped again, they stopped. The investigators had discovered a type of neuron that was sensitive to the monkey observing a particular human action. It was not surprising that following training to perform an action, some neurons in the motor region of the brain responded while performing that action, when the same neurons would not have responded beforehand. However, it was extremely surprising to find that some of those neurons also responded vigorously when the monkey observed the very same learned actions. Through a methodical and systematic approach, this group was able to make a more elaborate and far-reaching set of observations. For a small subset of neurons, if a monkey had learned to reach for a particular object, seeing another monkey reach for the same object would cause the neuron to fire. For a different subset of neurons, if the Page | 79 monkey had learned to pucker up his lips, the neuron would fire both when the monkey did this or when the monkey observed another monkey (or even a human) doing this. These motor neurons have been dubbed “mirror neurons”, since they respond during both execution of action and during observation of the same action in a mirror-like fashion. 3 Mirror neurons are not active during observation of an appropriate action if there is no goal (i.e., the object is absent) or when an appropriate object is presented alone. Mirror neurons have been discovered both for mouth actions and hand actions, and for both visual and auditory perception of actions. Seeing a previously learned action performed by someone else seems to resonate in some neurons in the motor system almost as if the action were being performed by the observer. It is as if the observed action stimulates some motor neurons to “remember” what it was like to perform action. Of course, this is not memory in the overt sense of conscious recollection, but rather that the experience of execution changes the response of the neurons to observation. Not all the motor neurons respond this way but a small number have been shown to respond when performing and observing an action. Such mirror neurons could provide a correspondence between the experience one has of performing an action and seeing the same action performed by others. These mirror neurons might provide one basis for understanding action. Relating actions we observe to actions we have carried out seems like an important component for comprehension. After all, we knew what we were doing when we performed an action. If that experience is somehow reinstated during observation we might attribute our past experience as the interpretation of the present observation. Imitation when observing an action might occur because our motor system is stimulated by observing an action. Coordination of action could occur because in representing others’ actions as if they were our own, our brains may be able to compute the time when we can act without disrupting the other person. This is just the kind of process that is described in Gun Semin’s chapter when he describes how groups of people can synchronize their actions like clapping together. From monkey brains to human intention Of course, relating responses in monkey brains to human brains is neither direct nor simple. Parts of the monkey brain and and parts of the human brain that putatively correspond, while similar, are not identical in number or size or location, and probably do not do exactly the same things, since monkeys and humans have evolved to have somewhat different capacities and behaviors. Furthermore, the study of mirror neurons in monkeys is based on recording the responses of individual neurons, which is not generally possible in humans except in rare cases of medical necessity. The measures we can make on intact human brains come from the responses of many thousands of neurons, so it is difficult to make claims about neurons that respond in producing an action and perceiving the same action. This means that any claims about human mirror neurons depend on a degree of good faith and inference rather than specific empirical demonstration that individual neurons respond both to observing and executing action. Page | 80 Researchers have measured human brain responses using a variety of methods such as functional magnetic resonance imaging (fMRI), which demonstrate reliable effects of changes in neural activity by changes in blood flow. Although slower to respond than measures of electrical activity, fMRI provides evidence about where neural activity in the human brain occurs. This kind of research does show that observing action produces activity in areas of the human brain more typically associated with executing action. While there may be some disagreement about which motor areas of the human brain are active while observing or imitating action and how these would correspond to areas in the monkey brain, there is good agreement that the human motor system responds for observation and imitation of action. 4 There is quite a difference between recognizing an action and understanding that action. We can see a hand move through space with an open palm oriented with the flat of the palm moving toward the surface of an object and predict where the hand will strike the object and that it will apply force to the surface of that object. But understanding the same general action as pushing a door open with the intent to enter and slapping a person in the face is quite different. A ball can be thrown in a game of catch or as a missile intended to do harm. The actions may be similar but the intentions are different. Therefore it is important that some researchers have argued that mirror neurons respond to the intention as well as the action. 5 However, to date there has been no clear evidence that such neurons respond to intention -- just that the sight of the action of reaching without an object to grasp, the sight of the object alone, and the sight of the action with the object present show different patterns of brain response. The fact that such different visual experiences lead to different patterns of brain activity does not provide clear evidence that intentions or goals are somehow part of the mirror neuron response to observed action. Understanding spoken language as action understanding The potential ambiguity of action is perhaps clearest if we consider language. Talking is a form of action and understanding speech might be a form of action understanding. In talking, mouth movements are made in such a way as to create sounds that will have some affect on the listener, as discussed in Howard Nusbaum’s chapter. Listeners must understand what was meant by making those sounds. However, if someone says, “It’s hot in here,” or “You are a great friend,” there can be ambiguity about the meaning. Such sentences could be straightforward observations as they seem to be or they could be something very different. We can ask to have a window opened or we can make a negative social comment using exactly the same sentences. Nonetheless, there is good reason to believe that the human action system is involved in understanding speech as well as producing it. While some ambiguities in speech or behavior simply cannot be resolved without broader contextual knowledge, the motor system may be important in understanding. If you try to have a conversation in a noisy bar, looking at your friend talking makes it easier to understand what is being said. We have shown that the motor system contributes to this process of recognizing speech. When listeners can see someone’s face while talking, mouth Page | 81 movements increase activity within the motor system measured using fMRI. Furthermore, it is possible to show that the same parts of the motor system can be active in talking and in understanding speech. By analyzing which parts of the brain are active and when they become active, it is possible to show that when motor system activity in the frontal lobe of the brain precedes activity in other regions (e.g., the temporal lobe), listeners have a better understanding. 6 It is as if the motor system “recognizes” the speech before other parts of the brain when the talking mouth is visible to the listener. This study shows that more information about the action of producing speech (visible mouth movements) can activate the motor areas of the brain during understanding of speech. But it is also the case that understanding speech without seeing the speaker depends on the motor system. Hockey players are experts at hitting slap shots, blocking passes, and whacking each other in the head with hockey sticks. They have done these things in the real world just as monkeys in Parma have learned to reach for certain objects. When hockey players listen to sentences describing hockey action, even without seeing the speaker or the action, motor areas are active during sentence understanding and these same motor areas are not active in people without hockey experience. 7 Understanding described actions appears to be influenced by the motor systems of people who have experience with those actions. Understanding action may be influenced by the experiences of our motor systems. Reading minds through action In understanding other people, we start with what we understand about ourselves. As Nick Epley describes in his chapter, we take this kind of egocentric perspective in understanding other people or pets or God or the behavior of inanimate objects. We know what we meant when we say something or do something and we make the same attribution to others, even nonhuman others. While this may be a good starting point for religions to help people feel connected to God, as discussed by Clark Gilpin, it may not be uniformly informative about human behavior. Behavior is not transparent for the intention of that behavior. The fact that any particular action is not necessarily unique to the intent behind it is the basis of a great deal of misunderstanding in daily interactions. As a result, even if mirror neurons help our brains recognize actions and sometimes interpret them, there are real limits to how experienceproducing actions can correctly inform social understanding. In spite of this limitation, we may often do just this—assume we understand another’s actions because of what we would intend were we to do the same thing in the same circumstance. Human social understanding does suffer egocentric limitations often and to the extent that it does, something like a mirror neuron system may play a role. For example, as discussed by Jean Decety in his chapter, our ability to understand the pain of others may derive in part from the neural systems involved in our experience of pain, but goes beyond this starting point. The social brain is on one level perhaps a very egocentric brain. But the fundamental motivation to connect with others has resulted in systems built on top of these egocentric foundations. If social Page | 82 understanding depended entirely on past experiences of our own intentions and actions, there might be much more misunderstanding and cynicism in the world. However, the capacity to reason, hypothesize, and model possible futures may increase social understanding beyond the anchor of purely egocentric perspective. We can conceive of alternatives to our own goals and motives and relate those alternatives to the actions we observe. To some extent, this process might also involve the motor system by mentally simulating actions and anticipated responses. By imagining how we might act in some situation to achieve a goal or the alternative ways we may act given some intention, it may be possible to go beyond the limits of our own experience. Such constructive imagery may well depend on the motor system, along with other neural systems, but currently there is no scientific evidence that such a system might be linked with the operation of mirror neurons. Conclusion We are equipped to understand the world around us by relating what we perceive to our own experiences. With respect to actions in particular, our brains have specialized circuitry to relate previously executed actions to newly perceived ones, possibly by performing an internal (imagined) simulation of them. There is evidence too that we might understand the emotional states of others by a similar kind of process, whereby our brains activate circuits for experiencing the emotion as a way to understand that emotion in others. These brain mechanisms might also apply (to a greater or lesser degree) when we try to understand actions or feelings by nonhuman animals or even inanimate entities. This could be a partial biological explanation of anthropomorphism, as discussed by Epley and Gilpin. Of course as humans we have the ability to go beyond these strict egocentric limitations and recognize and respond to our social connections more explicitly. This ability to go beyond the more basic grounding of the way we understand others may subserve part of the goal of some religions, discussed by Kathryn Tanner, in fostering a more abstract view of our connection to others. While a mirror neuron system might help form the basis for some aspects of social understanding, there may well be other invisible forces at work supported by these and other neural systems in our social brain. References 1. Hasson, U., Nusbaum, H. C., & Small, S. L. (2009). Task-dependent organization of brain regions active during rest. Proceedings of the National Academy of Sciences of the United States of America, 106(26), 10841- 10846. 2. Dewey, J. (1903). Democracy in Education. The Elementary School Teacher, 4(4), 193- 204. 3. Gallese, V., Fadiga, L., Fogassi, L., & Rizzolatti, G. (1996). Action recognition in the premotor cortex. Brain, 119 ( Pt 2), 593-609. 4. Iacoboni, M., Woods, R. P., Brass, M., Bekkering, H., Mazziotta, J. C., & Rizzolatti, G. (1999). Cortical mechanisms of human imitation. Science, 286(5449), 2526-2528. 5. Iacoboni, M., Molnar-Szakacs, I., Gallese, V., Buccino, G., Mazziotta, J. C., & Rizzolatti, G. (2005). Grasping the intentions of others with one's own mirror neuron system. PLoS Biology, 3, 529-535. Page | 83 6. Skipper, J. I., van Wassenhove, V., Nusbaum, H. C., & Small, S. L. (2007). Hearing lips and seeing voices: how cortical areas supporting speech production mediate audiovisual speech perception. Cerebral Cortex, 17, 2387-2399. 7. Beilock, S. L., Lyons, I. M., Mattarella-Micke, A., Nusbaum, H. C., & Small, S. L. (2008). Sports experience changes the neural processing of action language. Proceedings of the National Academy of Sciences, 105, 13269- 13272. Page | 84 Connecting and Binding Social Brains and Minds We evolved as social organisms in the context of face-to-face interaction. Much of our human biology was established before the technology of email and cell phones. As a result, our biological nature is tuned primarily to social signals and interaction that occurs in the presence of another. It takes just a moment of observation for us to know a lot about another person as a social being. We can understand other speakers easily within tens of milliseconds of experience. Our brains have developed to make this kind of social connection quickly and easily, whether through language or action. In order to understand someone else, we need to be able to understand their goals and intentions. Moreover we need to relate their behavior to our own individual and personal experience. Steve Small discusses some of the brain machinery that may allow us to translate our perception of language and observation of behavior into a form that can be related to our own use of language and action. This kind of resonance with experience, rather than elaborate inferences, may allow us to connect quickly with others, satisfying our drive for sociality. But understanding behavior and communication is not all there is to forming social connections. It is one thing to read intentions and another to feel someone’s pain. If we only could understand action and communication, an important element of human connection would be missing. In forming a collective mind, as Gün Semin discusses it, we need to have collective emotional responses. Jean Decety discusses the foundations of empathy and the brain machinery that supports this important capacity by providing a resonant response to the observation of another person’s distress. Although sympathy may motivate helping others, empathy may be one of the social glues that binds us together as a collective social organism. Page | 85 Chapter 9 9 Empathy and Interpersonal Sensitivity A young girl, after watching a televised documentary account of child hunger and suffering in Bangladesh, pleads with her parents to “do something” to help them. A new child in 9 The lead author is Jean Decety, Ph.D., the Irving B. Harris Professor in the Departments of Psychology and Psychiatry, and co-director of the Brain Research Imaging Center at the University of Chicago Medical Center. He is the editor of the journal Social Neuroscience. His interests include the investigation of the neurobiological mechanisms underpinning interpersonal sensitivity, particularly empathy and sympathy. His recent work focuses on developmental neuroscience with both typically developing children and adolescents as well as in children with deficits in empathic responding such as antisocial behavior problems. Decety has published more than 115 scientific papers, and recently edited the Social Neuroscience of Empathy (2009, MIT press), and Interpersonal Sensitivity: Entering Others’ World (2007, Psychology Press). Empathy and sympathy play crucial roles in much of human social interaction and are necessary components for healthy co-existence. Sympathy is thought to have a key role in motivating prosocial behavior, guides our preferences and behavioral responses, and provides the affective and motivational base for moral development. Although the study of these abilities has traditionally been examined using behavioral and clinical methods, recent work in social neuroscience has begun to provide compelling and novel insights on the neural mechanisms involved in interpersonal sensitivity. These developments are explored in this essay. daycare is being ignored by the other children with the exception of one little boy who takes her hand and includes her in all his activities. These modest beginnings signal the important and ongoing role of empathy for surviving and flourishing in our social world. Empathy has been suggested to be essential to navigating the social world; it enhances our understanding of others, improves the effectiveness of our social communication, and fosters mutually satisfying social relationships. Conversely, lack of empathy or its maladaptive use causes social relationships to falter and fail. Empathy refers to our natural capacity to quickly and automatically relate to the emotional states of another person. Rudimentary forms of empathy appear early in the life course, and with maturation, empathy can be experienced by simply reading about or imagining someone else’s emotion. Empathy comes so naturally that physicians must learn to dampen their empathic pain responses when inserting a needle into a patient (1). Just because empathy comes naturally does not mean, however, that it is instantiated in a discrete brain module that is automatically activated when one witnesses another’s distress or suffering. Rather, the experience of empathy is underpinned by the combined activity of several dissociable psychobiological systems. Further, empathy can be modulated by various contextual, dispositional, and interpersonal factors. The study of empathy, using sophisticated methods from psychology, neurology, neuroimaging, and neuropsychology, provide a unique opportunity to understand the invisible power of empathy in shaping our obligatorily gregarious social nature. Defining empathy and its functions Page | 86 Empathy can be defined as our natural capacity to share, appreciate, and respond to the affective states of others. This capacity is essential for the regulation of social interactions. For instance, empathy is believed to motivate prosocial behavior and inhibit aggressive behavior (2). In addition, our ability to share the emotions of those we observe binds us to each other and fosters a collective social identity. Empathy’s invisible power is that it moves us to cooperate, coordinate our behaviors, and provide the needed care for one another. Notably, however, empathic concern does not necessarily lead to empathic behavior. First, empathy poses a paradox, as sharing of feelings does not necessarily imply that one will act or even feel impelled to act in a supportive or sympathetic way. Second, the complexity of the social and emotional situations eliciting empathic concern influences the probability and nature of the help provided. Whether and how empathic actions are expressed depends on the feelings we perceive in the other, our relationship with that individual, and the context in which we share an emotional state. Empathy is critical for complex human interactions, but this does not mean that empathy and prosocial behavior have suddenly appeared with Homo sapiens. If empathy is a potent invisible force generated by the social brain, some form of emotion-sharing should also be evident in other social species such as non-human primates. Indeed, field observations conducted by comparative psychologists and ethologists suggest that behaviors homologous to empathy can be found in non-human primates (2). Some have argued that empathy is not an all-ornothing phenomenon, and that many intermediate forms of empathy exist between the extremes of mere agitation at the distress of another and full understanding of their predicaments (3). Many comparative psychologists view empathy as a kind of induction process by which emotions, both positive and negative, are shared, and which increase the probability that the protagonists will subsequently engage in similar behavior. Though certain non-human primates may share feelings between individuals, humans seem to have the unique ability to intentionally “feel for” and act on behalf of other individuals whose experiences may differ greatly from their own. Such a capacity may help explain why empathic concern is often associated with prosocial behaviors such as helping kin, and why it has been considered the foundation for altruism, the expression of empathy and caring for those who are not kin. Evolutionary biologists have suggested that empathic helping behavior evolved because of its contribution to genetic fitness (kin selection). In humans and other mammals, an impulse to care for offspring is almost certainly genetically hard-wired. Less clear, however, is whether an impulse to care for siblings, more remote kin, and similar non-kin is genetically hard-wired. The emergence of altruism is not easily explained within the framework of neo-Darwinian theories of natural selection (but see Cacioppo’s chapter on this point). Social learning explanations of kinship patterns in human helping behavior are thus highly plausible. Indeed, one of the most striking aspects of human empathy is that it can be felt for virtually any “target,” even targets of a different species (animals included). We can see a deer hurt by a passing car or the dogs locked in crates at a shelter and feel Page | 87 strongly for their pain or confinement and future. In part, this kind of empathic extension may be motivated by the kind of anthropomorphic attitudes we have about non-human entities as discussed by Nick Epley in his chapter. The fact that we are adept at “feeling for” very different others whom we can observe but not truly understand suggests that we possess a capacity to cognitively rerepresent others in our mind in a way we can understand. Indeed, second-order representation is a key component of empathy in humans, and may be a useful adaptation for human survival because it maximizes the range of individuals with whom we can form a social bond. The Components of Empathy The psychological components that make up full-blown empathy are supported by distinct and separable psychobiological systems. Empathy can be decomposed into an affective component that includes the perception and sharing of an emotional state observed in another individual, and a cognitive component that includes the motivation and intention to respond. Closely related is a regulatory component that involves adjustment of one’s emotional and behavioral response. The affective, cognitive, and regulatory aspects of empathy involve interacting, yet partially non-overlapping neural circuits. The initial component in the overall process leading to empathy draws on somatic mimicry, also known as “emotion contagion.” This affective component of empathy develops earlier than the cognitive component. Affective responsiveness is present at an early age, is involuntary, and relies on mimicry and linking of actions perceived in others with actions in oneself (i.e., perceptionaction coupling). For instance, newborns and infants become vigorously distressed shortly after another infant begins to cry. Facial mimicry of basic emotional expressions also contributes to affective sharing, and this phenomenon starts very early in life, by approximately 10 weeks of age. This primitive mimicry mechanism, which may be based on mirror neurons, which are sensorimotor neurons found in the premotor, motor, and posterior parietal cortex of the brain that become active when observing as well as when enacting a behavior as discussed in Steven Small’s chapter. This kind of mechanism may contribute to the development of empathy in the early preverbal period, and continues to operate past childhood. There is evidence that when we perceive emotions and actions of others, we use the same neural circuits as when we produce the same emotions and actions ourselves (e.g., watching another individual being disgusted and experiencing disgust in oneself activate similar neural circuits). For instance, viewing facial expressions triggers expressions on one’s own face, even without explicit identification of what we’re seeing (4). The cognitive component of empathy is closely related to processes involved in “theory of mind” (i.e., the ability to attribute mental states to others and to understand that others’ mental states can differ from one’s own) and self-regulation. The capacity for two people to resonate with each other emotionally, prior to any cognitive understanding, is the basis for developing shared emotional meanings, but it is not enough for mature empathic understanding and concern. Such an understanding requires the observer to form an explicit representation of the feelings of another person, a process that Page | 88 involves additional mechanisms beyond the sharing of emotion and includes selfregulatory mechanisms to modulate the observer’s experience of negative arousal. Specifically, in order to understand the emotions and feelings of others in relation to oneself, secondorder representations of the other must be consciously available and must not confuse the other with the self. The medial and ventromedial prefrontal cortices are known to play crucial roles in decoupling first-person and thirdperson information and maintaining representations of the other as distinct from the self (5). The regulatory component of empathy, especially regulation of internal emotional states and processes, is particularly relevant to the modulation of vicarious emotion and the experience of empathy as well as sympathy. Empathy is unlikely to lead to helping behavior if the observer is incapacitated by strong empathically evoked emotions, which is why emotional regulation is an important component in empathy. Indeed, children high in effortful control show greater empathic concern, and the tendency to experience empathy and sympathy versus personal distress varies as a function of their ability to regulate their emotions more generally. How We Perceive Other People in Pain When witnessing another person experiencing pain, the scope of an observer’s reaction can range from concern for personal safety, including feelings of alarm, fear, and avoidance, to concern for the other person, including compassion, sympathy, and care-giving. The existence of the perception-action coupling mechanism apparent in emotional contagion also seems to account for our ability to perceive and understand the pain of others. In the case of pain, individuals are predisposed to find distress of others aversive and learn to avoid actions associated with this distress. This is even the case in many mammalian species, including rodents. For instance, rats that had learned to press a lever to obtain food would stop doing so if their response was paired with the delivery of an electric shock to a visible neighboring rat (6). Recently, a handful of functional neuroimaging studies performed with healthy human volunteers revealed that the same neural circuits implicated in processing the affective and motivational aspects of pain in oneself account for the perception of pain in others (7). In one study, participants in a magnetic resonance imaging (MRI) scanner either received a painful stimulus or, in other trials, observed a signal that their partner, who was present in the same room, would receive the same stimulus. First-hand experience of pain resulted in activation of the somatosensory cortex, which encodes the way we feel aspects of a noxious stimulus such as its bodily location and intensity. Furthermore, the anterior medial cingulate cortex (ACC), and the anterior insula were activated during both first-hand pain and the anticipated experience of pain in someone else. These regions are responsible for the affective and motivational processing of noxious stimuli such as those aspects of pain that pertain to desires, urges, or impulses to avoid or terminate a painful experience. A number of other neuroimaging studies of empathy for pain in adults as well as in children have demonstrated that the somatosensory cortex is not activated only during first-hand pain but is also activated with the perception of other Page | 89 people in pain. Altogether, there is strong evidence to suggest that perceiving the pain of others triggers an automatic somatic sensory-motor mirroring mechanism between other and self, which activates almost the entire neural pain matrix including the periaqueductal gray, a major site in pain transmission and for processing of fear and anxiety, and the supplementary motor area that programs defensive movements in response to anticipated pain. Such a neural resonance mechanism provides a functional bridge between first-person and third-person information. It is grounded in the equivalence of self and other, which allows for analogical reasoning, and offers a possible, yet partial, route to understanding others. Of course, human empathic abilities are more sophisticated than simply yoking perceptions of the self and other. In the eighteenth century, Scottish philosopher and economist Adam Smith proposed that through imagination, “we place ourselves in his situation… enter as it were into his body, and become in some measure the same person with” (8). By means of imagination we come to experience sensations which are generally similar to, although typically weaker than, those of the other person. This capacity to engage in role-taking has been theoretically linked to the development of empathy, moral reasoning, and more generally, prosocial behavior. Unlike the motor mimicry and emotional contagion aspect of empathy, perspective-taking develops later, possibly because it draws heavily on the maturation of executive functions (i.e., processes that serve to monitor and control thought and actions, including self-regulation, planning, cognitive flexibility, response inhibition, and resistance to interference), functions that are predominantly centered in the prefrontal cortex which continues to mature from birth to adolescence. Theoretically, imagining the other is distinct from imagining the self: the former may evoke empathic concern (defined as an other-oriented response congruent with the perceived distress of the person in need) while the latter induces both empathic concern and personal distress (i.e., a self-oriented aversive emotional response such as anxiety or discomfort). This distinction has been supported empirically. When individuals are asked to imagine how they would feel in reaction to emotionladen familiar situations and to imagine how a known person would feel if she was experiencing the same situations, common neural circuits are activated both for the self and the other. However, relative to imagining the self, imagining the other results in specific activation of parts of the frontal cortex that are implicated in executive control—the use of attention and working memory and decisions—and an area of the brain at the interface of the temporal and parietal lobes of the brain that is a key component of a larger network of neural circuits involved in attention (sometimes called the temporoparietal junction). Some researchers have hypothesized that the role of the frontal lobes and the temporoparietal junction is to hold separate perspectives or to resist interference against attention to one’s own perspective. In a recent functional brain imaging study (9), participants were shown pictures of people with their hands or feet in painful or non-painful situations with the instruction to imagine themselves or to imagine another individual experiencing these situations. During perception of painful situations, Page | 90 both the self-perspective and the otherperspective were associated with activation in the neural network involved in pain processing. These results reveal the similarities in neural networks representing first- and third-person information. In addition, however, the self-perspective yielded higher pain ratings and involved more extensive activation of some circuits in the pain matrix than did the other-perspective, thus highlighting important differences between self- and other-perspectives. Neuroanatomical regions and circuits form the foundation for the experience of pain in others, but they are not sufficient to explain variability in interpersonal sensitivity. Although empathetic brain circuits are activated by the mere perception of pain in others, activity in these circuits can be modulated by social, motivational, and cognitive factors. For example, observing pain in likable others (i.e., those who played a game fairly) resulted in an enhancement of empathic brain responses, whereas pain in dislikable others who played unfairly did not. Another functional MRI study (10) found that participants showed significantly greater responses in neural regions that are involved in pain perception when observing the pain of people who were not responsible for their stigmatized condition (i.e., individuals who contracted AIDS as the result of a blood transfusion) than either controls (healthy individuals) or people who were held responsible for their condition (i.e., those who contracted AIDS through illegal drug use). In addition, participants expressed more empathy and personal distress in response to the pain of people who were not responsible for their stigmatized condition as compared to controls. The level of empathic response, therefore, seems to be influenced by motivational factors as well as the interpersonal relationship between the target and the observer. Altogether, these findings demonstrate that the similarities between affective representations of the self and the other stem from shared neural circuits that can be emulated either automatically or intentionally by the act of perspective-taking. Importantly, these findings also point to some distinctions between these two representations, distinctions that contribute to our capacity to detach ourselves from others sufficiently to make considered responses to their pain. Conclusion Empathy, the natural capacity to share, appreciate, and respond to the affective states of others, plays a crucial role in much of human social interaction from birth to the end of life. As would be expected if empathy functions to enhance social cohesion, social nonhuman primate species also exhibit rudimentary versions of empathy. What humans have in abundance are higherlevel cognitive and social abilities (language, theory of mind, executive functions) that can be deployed to modulate empathic responses, and that are amenable to modulation by lowerlevel processes such as emotional contagion and mimicry. These levels of processing enable empathy to have an impact on a wide variety of human behaviors. From motivating prosocial behavior to providing the affective and motivational bases for moral development, empathy is an invisible force to reckon with when considering how humans behave toward each other. References Page | 91 1. Cheng, Y., Lin, C., Liu, H.L., Hsu, Y., Lim, K., Hung, D., & Decety, J. (2007). Expertise modulates the perception of pain in others. Current Biology, 17, 1708-1713. 2. De Waal, F. (2009). The Age of Empathy: Nature's Lessons for a Kinder Society. New York: Harmony Books. 3. De Waal, F. B. M. (2009). Darwin’s last laugh. Nature, 460, 175. 4. Meltzoff, A.N., & Decety, J. (2003). What imitation tells us about social cognition: A rapprochement between developmental psychology and cognitive neuroscience. The Philosophical Transactions of the Royal Society, London, 358, 491-500. 5. Decety, J., & Sommerville, J.A. (2003). Shared representations between self and others: A social cognitive neuroscience view. Trends in Cognitive Sciences, 7, 527-533. 6. Church, R. M. (1959). Emotional reactions of rats to the pain of others. Journal of Comparative and Physiological Psychology, 52, 132-134. 7. Decety, J., & Lamm, C. (2009). Empathy and intersubjectivity. In G. G. Berntson & J. T. Cacioppo (Eds.), Handbook of neuroscience for the behavioral sciences (Vol. 2, pp. 940-957). Hoboken, NJ: Wiley. 8. Smith, Adam. The Theory of Moral Semtiments. Edited by Sálvio M. Soares. MetaLibri, 2005, v1.0p. 9. Jackson, P.L., Brunet, E., Meltzoff, A.N., & Decety, J. (2006). Empathy examined through the neural mechanisms involved in imagining how I feel versus how you feel pain: An event-related fMRI study. Neuropsychologia, 44, 752-61. 10. Decety, J., Echols, S.C., & Correll, J. (2009). The blame game: the effect of responsibility and social stigma on empathy for pain. Journal of Cognitive Neuroscience, Epub ahead of print. Page | 92 Seeing into My Mind and Other Minds Empathy is defined by Jean Decety as “the natural capacity to share, appreciate, and respond to the affective states of others.” Empathy rests on our ability to see into the mind of another while distinguishing it from one’s own to be in a position to cooperate, coordinate, and provide the needed care for others. The possession of empathic capacity is not sufficient to determine the precise nature of the response toward others, however. As Decety points out, whether an individual attends to and responds empathically upon observing emotion in another individual depends on, among other things, dispositional tendencies, the relationship between the individuals, and contextual constraints. Motivation to help another is also influenced by the amount of cognitive effort we are willing and able to exert to take the perspective of the other. Perspective-taking is essentially an attempt to see into the invisible mind of another. What we can’t see, we model based on our own mind and like-minded individuals. Nick Epley shows that seeing into and connecting with other minds is such a frequent operation of the social brain that the absence of others inclines people to see human minds in nonhuman entities. Whether it’s a tree, a pet, or God, ascribing mind to others endows them with the capacity to experience the same affective states we experience. This shared capacity evokes in us a tendency to feel and express empathic concern for their well-being. Unfortunately, humans do not grant all individuals, much less non-human entities, an equivalent degree of mind. Epley articulates how differences in the capacity to see mind in others have consequences for the way we feel and think about and behave toward others. Page | 93 Chapter 10 10 Seeing Invisible Minds Shortly after taking off from LaGuardia airport in the dead of winter, the engines of US Airways flight 1549 failed after inhaling several large geese. The pilots glided their plane onto the Hudson River, where all of the 10 The lead author is Nicholas Epley, Ph.D., a Professor of Behavioral Science at the University of Chicago Booth School of Business. His research investigates people’s ability to reason about others’ minds, from knowing how one is being judged by others to predicting others' attitudes, beliefs, and underlying motivations, and the implications of systematic mistakes in mind reading for everyday social interactions. His research has appeared in more than two dozen journals, has been featured by the Wall Street Journal, CNN, Wired, and National Public Radio, among many others, and has been funded by the National Science Foundation and the Templeton Foundation. Epley has written for the New York Times, produced lectures for the Financial Times, been elected as a Fellow of the Association for Psychological Science, and is the winner of the 2008 Theoretical Innovation Prize from the Society for Personality and Social Psychology. Other minds are inherently invisible. You cannot see an attitude, smell a belief, or touch an intention, and yet you can nevertheless “see” these mental states in other people with great ease. You can even see them in agents ranging from pets to gadgets to gods. How you are able to see other minds, and how they become visible, matters because it marks the difference between treating others as human beings worthy of moral care and concern versus treating others as objects or animals. passengers were rescued, cold, wet, and almost completely unharmed. Explained one passenger, “God was certainly looking out for us.” New Orleans Mayor Ray Nagin offered a very different assessment of God’s mind following the devastating impact of Hurricane Katrina when he explained that, “Surely God is mad at America. Surely he’s not approving of us being in Iraq under false pretense. But surely he’s upset at Black America, too.” Depending on your own beliefs, such statements will seem somewhere between insane and insightful. To psychologists, they seem impressive. They seem impressive not because they reveal a keen sense of causal inference, but rather because they reveal what may be the most impressive capacities of the social brain—the ability to reason about, or “to see,” what other minds see. Introspection enables you to know your own intentions, report on your own thoughts, feel your own pain, and recognize when you are feeling shame rather than guilt. Other minds, however, are inherently invisible. You cannot know what it is like to be another person on the inside because your skull gets in the way. The inherent invisibility of other minds poses a major problem for hardnosed philosophers, who skeptically note that people cannot infer that other minds exist at all. Although it is surprisingly difficult for philosophers to reject the skeptical conclusion from the “other minds problem,” almost everyone else casts it aside altogether some time around the age of five. At this point people have developed such a strong capacity to think about other minds that they not only see minds in other people, but they seem to see other minds almost everywhere 1 . Gods can be caring or Page | 94 callous. Pets can be thoughtful or devious. And every now and then, computers can have a mind of their own. Having the capacity to reason about other minds enables people to form deep social connections with others, to empathize with others’ pain and share in their joy, and to anticipate others’ actions. But having a capacity and actually using it are two different things. People are not naturally inclined to see invisible things in the environment. People do not automatically see into other minds, either, but instead do so only under certain circumstances and with some psychological effort. This chapter will describe how people come to see other minds, how other minds can become more or less visible, and why the visibility of other minds matters for everyday life. Kinds of Minds Studying how people understand other minds first requires understanding how people intuitively define another mind. Research suggests that people think of minds as having two distinct dimensions, the ability to act (agency) and the ability to feel (experience) 2 . Mindful agency involves the cognitive activities that enable action, such as the capacity to plan, to have intentions, to engage in deliberate self-control, and to pursue one’s own goals. Conscious preferences, attitudes, and beliefs follow from these capacities. Mindful experience, in contrast, involves the cognitive activities involved in reacting to the external world, such as the capacity for self-awareness, and the experience of basic psychological states (like hunger, thirst, or pain), and otheroriented emotions (such as empathy or sympathy). Mindful experience also involves the capacity for metacognition—the capacity to think about one’s own thoughts or emotions— exemplified in experiences such as confidence and doubt, or in secondary emotions such as shame, guilt, joy, or hope. People seem to represent these two capacities in others quite independently. A sociopath, for instance, can appear to act with a high degree of mindful agency but no mindful experience, whereas a baby might appear full of mindful experience with relatively little mindful agency. Seeing other agents as mindful essentially means seeing them as able to consciously think and/or to feel. Because you are aware of both your own thoughts and feelings, you likely consider yourself—like most people do—to be very mindful. Making Other Minds Visible Introspection provides a kind of flashlight that seems to provide direct access to one’s own agency as well as experience. Although research demonstrates that introspection is actually a process of indirect inference, it appears to us that introspection provides direct access to the workings of our own brain. It seems that we can look on the inside and feel when we are suffering, know when we are experiencing regret, or be aware of our intentions to lose weight. We can use our introspective abilities to make inferences about what others are likely thinking or feeling (and we very often do), but such inferences are likely to seem inherently less direct, less immediate, and less illuminating. We cannot see into other minds as clearly as we seem able to see our own. When something is difficult to see, people may doubt whether it Page | 95 actually exists, or may not see it at all. This is true of the relative difficulty that people have seeing other minds compared to one’s own, in ways that are sometimes very subtle and surprising. For instance, we tend to evaluate ourselves by consulting our mindful intentions, but we evaluate others (and their intentions) by observing their actions. We may consider ourselves to be conscientious if we planned to buy our spouse a birthday gift, but need to see an actual gift to infer that our spouse is equally conscientious. 3 We tend to believe that we are more likely to experience complicated mental emotions like shame, guilt, or embarrassment than are others. 4,5 We tend to believe that our own behavior will therefore be guided by moral sentiments like empathy, guilt, or compassion whereas others’ behavior is more likely driven by the relatively mindless motives of self-interest. 6 Other minds are more opaque than our own, and some learning, attending, seeking, and projecting is required for our brains to become fully social and see into them. Here’s how 7 . Learning. Children do not enter the world able to think about other minds, but they learn to do so fairly quickly. At around three months of age, children start preferentially attending to animate objects compared to inanimate objects, and at around six months of age start to distinguish between intentional (goal-directed) and unintentional (accidental) action. At this age, for instance, children will look reliably longer at a person who is reaching for a cup than to a person who is making the same reaching motion in the absence of a cup. Over the next 18 months, children become more likely to mimic intentional than unintentional actions 8 , to follow the gaze of another person and therefore share his or her attentional focus, and recognize that other people may have preferences that differ from one’s own. By age two, children’s social ability to read other minds seems to have already surpassed that of our nearest primate relatives, and over the next two years they pick up what appear to be uniquely human mind-reading capacities. By age five, children demonstrate the most sophisticated of mind-reading abilities—the capacity to recognize that others’ beliefs may differ from one’s own and to use those differing (sometimes mistaken) beliefs to predict the other agent’s behavior. Variability from age five onward comes from learning more specific details about how other minds actually work, largely gathered from personal experience, religious practice, or broader cultural norms. Many psychologists and neuroscientists speculate that learning to read other minds comes from the deeply social tendency, present at birth, to mimic others’ actions. For example, Steve Small examines a neurological underpinning for mimicry, and Jean Decety argues in his essay that an inborn capacity for mimicry underlies the human capacity for empathy. Looking where others look and copying their actions is a reasonable way to copy their likely mental states as well. This egocentric method of using one’s own mental experience as a guide to other minds continues to be employed throughout adulthood, and can give insight into others’ mental states but can also lead people to overestimate the extent to which others’ minds are similar to one’s own. These biases tend to be called egocentric when reasoning about other people, and they tend to be called anthropomorphic when reasoning about Page | 96 nonpeople such as a god or a gadget or a pet. Attending. People rarely notice things in their environment unless they are specifically attending to them. Other minds likewise tend to be relatively invisible unless attention is specifically drawn to them. For instance, take a moment to think about how happy you are compared to the average American… No really, please take a moment…If you just spent some time thinking about how happy you are and no time thinking about how happy the average American is, then you are no different from the majority of people in psychology experiments who do likewise 8 . People can consider others’ thoughts, feelings, beliefs, or emotions, but doing so requires mental effort that is in short and limited supply. Consider, for instance, a simple experiment in which you are playing a game with another person 9 . Both you and the other player in this game must first choose privately to cooperate or compete with each other. If you both choose to cooperate, you both earn $5. But if the other player chooses to cooperate and you choose to compete, then you win $10 and your partner gets nothing. If you, however, choose to cooperate and the other player chooses to compete, you win nothing and your partner wins $10. If you both choose to compete, you both win a measly $2. It seems obvious in this situation that you should consider both what you would like to do, but also consider what the other player is likely to be thinking. Experimental evidence suggests that people do indeed think about the former but spend little time thinking of the latter. In a basic version of this experiment, 60% of people chose to cooperate. However, when people were simply asked to think about their partner’s thoughts before making their choice, only 27% chose to cooperate. If people had already been thinking about others’ thoughts, as it seems like they would naturally be doing in this situation, then a simple instruction to consider others’ thoughts would have no effect on people’s own behavior. That is not the case. This simple experiment shows that people may not naturally consider other minds even when it appears that they should. Thinking about other minds requires attentional effort. It does not necessarily come automatically. Indeed, as Tanya Luhrmann describes in her chapter, people may have to work very hard to discern other minds, such as the mind of God, even when they are actively looking for them. Seeking. If seeing other minds requires attention, then other minds are especially likely to become visible when people are motivated to think about them. There are many reasons why people might try to get into the mind of another agent, from a spouse to a pet to a god, but two are reasonably wellsupported by existing research. First, people tend to think about other minds when they are trying to form a social connection with others. 10 Making people feel lonely or isolated, for instance, increases the tendency to describe one’s pet as thoughtful, considerate, or sympathetic (all mindful traits). And those who are made to feel lonely are also likely to report believing in mindful supernatural agents, such as God. Second, people tend to think about other minds when they are trying to achieve some understanding and control over their environment or over another agent’s behavior. 1 Concepts of mind, including attitudes, beliefs, goals, or desires, can provide compelling cause- Page | 97 and-effect explanations of behavior that give a sense of predictability and control. A meteorologist may know that a hurricane may strike here or there depending on environmental conditions. Lacking such knowledge, a hurricane that strikes here rather than there may lead people to invoke a mindful agent— such as a God—to explain that action. Projecting. If introspection makes your own mind visible, then you might assume that those who look similar to you on the outside might look similar to you on the inside as well. Indeed, animals that move at a humanlike speed (such as a horse) seem more mindful to people than do animals that move either much slower (such as a sloth) or much faster (such as a hummingbird). 11 And an agent that look humanlike, such as a computerized avatar with human face, seems more mindful than avatars that do not look humanlike. Any parent knows how well toy makers love to capitalize on this tendency. But it is the converse of this effect that is even more interesting— other minds become less visible as the agent becomes less similar to the self. Others that differ from you in their interests, nationality, or social status are likely to be seen as less mindful—less thoughtful, less likely to experience complicated emotions, less able to experience pain or suffering—than those that are similar to you. It is little wonder, then, that the history of human conflict is filled with instances of people dehumanizing radically different others, treating them like mindless animals or objects. 12 Why Minds Matter It may not be obvious to you why it matters that your neighbor, every now and then, thinks that her computer has a mind of it’s own, that a mayor believes that God punished his city by sending a hurricane, or that you truly believe that your pet poodle is thoughtful and considerate. Some of these attributions of mind seem purely metaphorical and therefore unimportant, as ways of speaking rather than ways of believing, whereas others seem to represent genuine beliefs about the real presence or absence of another social mind. But metaphors have a way of influencing behavior in ways that are consistent with believing the metaphor to be literally true. People metaphorically refer to feeling dirty after behaving unethically, and yet washing one’s hands actually reduces the guilt that people report feeling from engaging in unethical actions. 13 People are surely just speaking metaphorically when they refer to rejection as being given the cold shoulder, and yet research demonstrates that people do indeed report feeling that a room is colder after someone has just rejected them than after someone has just accepted them. 14 And surely people are only speaking metaphorically when they refer to the stock market as anxious or jittery, and yet describing the market as mindful leads stock traders to believe that trends are likely to continue whereas describing the market as mindless leads traders to predict more random variability. 15 Whether metaphorical or literal, seeing other agents as mindful matters because people tend to treat the agent as if it has a mind. That matters for at least three major reasons. First, mindful agents have both intentions and the capacity for selfcontrol. Mindful agents can therefore be held responsible for their actions. Possessing a guilty mind (mens rea) is necessary for being held criminally responsible for a crime in the US, a Page | 98 precedent found in courts around the world dating back to the Middle Ages. In times past and cultures in which people did not so naturally restrict intentional capacities to other humans, animals (such as rats) and objects (such as “possessed” statues) were common targets of criminal prosecution 16,17 . Increasing the extent to which other agents seem mindful also increases the praise or blame that they receive for their actions. And even diminishing the extent to which people feel in mindful control of their own behavior (e.g., by undermining people’s belief in free will), leads people to behave in ways that are consistent with diminished self-control (such as by cheating on an exam when tempted to do so). 18 Second, other minds are capable of thinking, and may therefore be thinking about you. Being under scrutiny by mindful agents has two basic effects on human behavior. One is that mindful agents become sources of social influence, increasing the extent to which people behave in socially desirable ways 20 . Imagine, for instance, how you might behave if you found a magic ring that made you invisible… and you’ll get the point. This ability for mindful surveillance to control behavior has been proposed as one of the reasons, if not the primary reason, why religious systems that posit an omnipresent deity are able to maintain such large-scale cooperative societies. The other effect of mindful surveillance is that it is mentally taxing to monitor others’ thoughts. This effortful monitoring can diminish a person’s performance on other cognitively demanding tasks 21 . And while waiting for a stressful event, such as giving a speech, people show less stress-related responses when in the presence of their relatively mindless pet than when in the presence of their relatively more mindful spouse 22 . Finally, other minds matter because mindful agents become moral agents worthy of care and compassion 7 . The principle of autonomy captures this most basic of human rights—that because all people have the same minimal capacity to suffer, deliberate, and choose, no person can compromise the body, life, or freedom of another person. Agents with mindful experience, the capacity to suffer, deliberate, and choose, become those that evoke empathy and concern for well being, whereas agents without mindful experience can be treated simply as mindless objects. From debates about abortion to animal rights to euthanasia, the mindful experience of the agents in question is often either the explicit or implicit focus of debate. Making invisible minds visible, and hence more like one’s own, enables people to more readily follow the most famous of all ethical dictates—to treat others as you would have others treat you. Conclusion It is impossible for scientists to examine whether God was looking out for the passengers of flight 1549 or punishing the residents of New Orleans with Hurricane Katrina, but it is very possible to examine why people might make such inferences. These examinations have revealed a remarkable capacity to look beyond the visible behavior that the environment provides to reason about a completely invisible world of intentions and goals, of motives and beliefs, of attitudes and preferences—an invisible world of other minds. Understanding when people are likely to recognize other minds (and see into them) and when they are not is the Page | 99 key to understanding when people may be likely to invoke natural versus supernatural explanations, when gadgets can seem to have minds of their own, and when people are likely to treat their pets as people and their enemies as animals. A mind like our own, with the capacity to see into other minds, is essential for an agent to be, as we are, fundamentally social. References 1.
 Epley,
 N.,
 Waytz,
 A.,
&
 Cacioppo,
 J.T.
(2007).
 On
seeing
human:
A
three–factor
theory
of
 anthropomorphism.
 Psychological
 Review,
 114,
864–886.
 2. Gray, H.M., Gray, K., & Wegner, D.M. (2007). Dimensions of mind perception. Science, 315, 619. 3. Kruger, J., & Gilovich, T. (2004). Actions, intentions, and trait assessment: The road to selfenhancement is paved with good intentions. Personality and Social Psychology Bulletin, 30, 328-339. 4. Leyens, J.P., Paladino, P.M., Rodriguez, R.T., Vaes, J., Demoulin, S., Rodriguez, A.P., & Gaunt, R. (2000). The emotional side of prejudice: The role of secondary emotions. Personality and Social Psychology Review, 4, 186-197. 5. Van Boven, L., Loewenstein, G., & Dunning, D. (2005). The illusion of courage in social predictions: Underestimating the impact of fear of embarrassment on other people. Organizational Behavior and Human Decision Processes, 96, 130–141. 6. Epley, N., & Dunning, D. (2000). Feeling “holier than thou”: Are selfserving assessments produced by errors in self or social prediction? Journal of Personality and Social Psychology, 79, 861-875. 7. Epley, N., & Waytz, A. (in press). Mind Perception. In S.T. Fiske, D.T. Gilbert, & G. Lindsay, (Eds.), The Handbook of Social Psychology (5 th ed.). New York: Wiley. 8. Kruger, J. (1999). Lake Wobegon be gone! The "below-average effect" and the egocentric nature of comparative ability judgments. Journal of Personality and Social Psychology, 77, 221-232. 9. Epley, N., Caruso, E.M., & Bazerman, M.H. (2006). When perspective taking increases taking: Reactive Egoism in social interaction. Journal of Personality and Social Psychology, 91, 872-889. 10. Epley, N., Akalis, S., Waytz, A., & Cacioppo, J.T. (2008). Creating social connection through inferential reproduction: Loneliness and perceived agency in gadgets, gods, and greyhounds. Psychological Science, 19, 114-120. 11. Morewedge,
 C.K.,
 Preston,
 J.,
 &
 Wegner,
 D.M.
 (2007).
 Timescale
 bias
 in
 the
 attribution
 of
 mind.
 Journal
 of
 Personality
 and
Social
Psychology,
93,
1–11.
 12. Haslam, N., & Bain, P. (2007). Humanizing the self: Moderators of the attribution of lesser humanness to others. Personality and Social Psychology Bulletin, 33, 57-68. 13. Zhong, C.B., & Liljenquist, K. (2006). Washing away your sins: Threatened morality and physical clensing. Science, 313, 1451-1452. 14. Zhong, C.B., & Leonardelli, G.J. (2008). Cold and lonely: Does social exclusion literally feel cold? Psychological Science, 19, 838-842. 15. Morris, M.W., Sheldon, O.J., Ames, D.R., & Young, M.J. (2007). Page | 100 Metaphors and the market: Consequences and preconditions of agent and object metaphors in stock market commentary. Organizational Behavior and Human Decision Processes, 102, 174–192. 16. Berman, P. S. (1994). Rats, pigs, and statues on trial: The creation of cultural narratives in the prosecution of animals and inanimate objects. NYU Law Review, 69, 288-326. 17. Sunstein, C.R., & Nussbaum, M.C. (2004). Animal rights: Current debates and new directions. New York: Oxford University Press. 18. Vohs, K.D., & Schooler, J.W. (2008). The value of believing in free will: Encouraging a belief in determinism increases cheating. Psychological Science, 19, 49-54. 19. Norenzayan, A., & Shariff, A.F. (2008). The origin and evolution of religious prosociality. Science, 322, 58-62. 20. Buss, A. H. (1980). Self- Consciousness and social anxiety. San Francisco, CA: W.H. Freeman. 21. Beilock, S. L. & Carr, T. H. (2005). When high-powered people fail: Working memory and "choking under pressure" in math. Psychological Science, 16, 101-105. 22. Allen, K. M., Blascovich, J., & Mendes, W.B. (2002). Cardiovascular reactivity and the presence of pets, friends, and spouses: The truth about cats and dogs. Psychosomatic Medicine, 64, 727-739. Page | 101 Inferring Minds Where None Can Be Seen The social brain seeks connections with others. But what is the foundation that we use to build such connections? We experience empathy as a form of emotional resonance and understanding of other people. This connection allows us to comfort and support and celebrate with others. Being in tune with emotional states of others allows us to respond in ways that strengthen a group. But how do we understand the thoughts and goals of others? How do we predict choices and decisions to facilitate cooperation in groups? Anthropomorphism is the basis for predicting behavior and thoughts and goals. Nick Epley discusses how anthropomorphism is rooted in an egocentric view of others. Moreover our view of others is not confined to the others that are people. It is perhaps reflective of the deep and fundamental nature of anthropomorphism in the social brain that its anthropomorphic inferences about agents can be derived from observed behavior, allowing us to understand “minds” where none may exist, as in mechanical toys or alarm clocks. Of course we tend to understand those minds by thinking they are just like us. Even when there is no agent to be seen, events in the world may be understood by attributing them to unseen agents. During World War II, the bombing of London was demonstrably random, but citizens of London could not help but discern intentional patterns in the attacks. As Epley points out, hurricanes and floods are even today attributed to the hand of God, perhaps an angry God. Clark Gilpin discusses how religions may use this aspect of the social brain to achieve an understanding of God and what God wants. This kind of anthropomorphism can be taken to different metaphoric extremes in personifying God as father or friend. But an overly concrete personification may have costs perhaps diminishing the universality and pervasiveness of God in other religions. Thus religions may differ in theological perspective on the value of the anthropomorphic impulse inherent in the social brain. Page | 102 Chapter 11 11 Anthropomorphism: Human Connection to a Universal Society When Jonathan Edwards, an angular New England minister in his late 11 The lead author, Clark Gilpin, Ph.D., is the Margaret E. Burton Professor of the History of Christianity at the University of Chicago Divinity School. Clark studies the cultural history of theology in England and America from the seventeenth century to the present. From 1990 to 2000, he served as dean of the Divinity School, and from 2000 to 2004 he directed the Martin Marty Center, the Divinity School’s institute for advanced research in all fields of the academic study of religion. His current research projects include a book with the working title Alone with the Alone: Solitude in American Religious and Literary History, which explores ways in which the spiritual discipline of solitary writing—autobiographic narratives, journals, and letters—shaped the careers of major New England intellectuals of the eighteenth and nineteenth centuries. Anthropomorphic representations of God make many modern people very nervous, including many religious people. Attributing human-like ideas and emotions to the comprehending powers of the universe not only seems out of step with modern science but also a presumptuous confinement of the world within merely human needs and capacities. Yet, the impulse to speak anthropomorphically about our “ultimate environment” has vigorously persisted into the modern age. Rather than dismissing anthropomorphism as an outmoded way of thinking, this essay adopts a historical approach to rethink why anthropomorphism exhibits this perennial capacity to focus the human ethical imagination on our relations with and obligations to the universe within which we live. thirties, mounted the narrow steps into the pulpit on July 8, 1741, the sermon he was about to preach would become one of the most famously electrifying orations in American history, “Sinners in the Hands of an Angry God.” Edwards preached this sermon during the massive transatlantic religious revival that gave rise to Methodism in England and came to be known in the American colonies as “the Great Awakening.” This was not