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| Genetic samples were obtained from a group of individuals Way, B. M., Taylor, S. E., & Eisenberger, N. I. (2009). Variation in the mu-opioid receptor gene (OPRM1) is associated with dispositional and neural sensitivity to social rejection. Proceedings of the National Academy of Sciences of the United Stated of America, 106 , 15079–15084.
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| The human visual system makes various assumptions James, W. (1890/1950). The Principles of Psychology . New York: Dover.
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| Kip Williams found that even when he told people Zadro, L., Williams, K. D., & Richardson, R. (2004). How low can you go? Ostracism by a computer is sufficient to lower self-reported levels of belonging, control, self-esteem, and meaningful existence. Journal of Experimental Social Psychology, 40 (4), 560–567.
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| why would all those others watch the bully Kaltiala-Heino, R., Rimpelä, M., Marttunen, M., Rimpelä, A., & Rantanen, P. (1999). Bullying, depression, and suicidal ideation in Finnish adolescents: School survey. Bmj, 319 (7206), 348–351; Juvonen, J., & Galván, A. (2009). Bullying as a means to foster compliance. In M. Harris (Ed.). Bullying, Rejection and Peer Victimization: A Social Cognitive Neuroscience Perspective . New York: Springer, pp. 299–318.
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| about 10 percent of students are bullied Fleming, L. C., & Jacobsen, K. H. (2009). Bullying and symptoms of depression in Chilean middle school students. Journal of School Health, 79 (3), 130–137; Wolke, D., Woods, S., Stanford, K., & Schulz, H. (2001). Bullying and victimization of primary school children in England and Germany: Prevalence and school factors. British Journal of Psychology, 92 (4), 673–696; Kaltiala-Heino, R., Rimpelä, M., Marttunen, M., Rimpelä, A., & Rantanen, P. (1999). Bullying, depression, and suicidal ideation in Finnish adolescents: School survey. Bmj, 319 (7206), 348–351; Kim, Y. S., Koh, Y. J., & Leventhal, B. (2005). School bullying and suicidal risk in Korean middle school students. Pediatrics, 115 (2), 357–363.
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| they involve belittling comments Nansel, T. R., Overpeck, M., Pilla, R. S., Ruan, W. J., Simons-Morton, B., & Scheidt, P. (2001). Bullying behaviors among US youth. JAMA: Journal of the American Medical Association, 285 (16), 2094–2100.
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| They think about committing suicide more Klomek, A. B., Marrocco, F., Kleinman, M., Schonfeld, I. S., & Gould, M. S. (2007). Bullying, depression, and suicidality in adolescents. Journal of the American Academy of Child & Adolescent Psychiatry, 46 (1), 40.
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| A 1989 Finnish study assessed the level of victimization Klomek, A. B., Sourander, A., Niemelä, S., Kumpulainen, K., Piha, J., Tamminen, T., … , & Gould, M. S. (2009). Childhood bullying behaviors as a risk for suicide attempts and completed suicides: A population-based birth cohort study. Journal of the American Academy of Child & Adolescent Psychiatry, 48 (3), 254–261.
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| Suicide-related thoughts are actually quite similar Smith, M. T., Edwards, R. R., Robinson, R. C., & Dworkin, R. H. (2004). Suicidal ideation, plans, and attempts in chronic pain patients: Factors associated with increased risk. Pain, 111 , 201–208.
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| and independently performed an anagram Hegtvedt, K. A., & Killian, C. (1999). Fairness and emotions: Reactions to the process and outcomes of negotiations. Social Forces, 78 (1), 269–302.
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| Psychologist Tom Tyler found that defendants in court cases Tyler, T. R. (1984). The role of perceived injustice in defendants’ evaluations of their courtroom experience. Law & Society Review, 18 , 51.
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| evidence for or against the notion that fairness Tabibnia, G., Satpute, A. B., & Lieberman, M. D. (2008). The sunny side of fairness: Preference for fairness activates reward circuitry (and disregarding unfairness activates self-control circuitry). Psychological Science, 19 , 339–347.
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| studies typically observe activity in the anterior insula and the dACC Sanfey, A. G., Rilling, J. K., Aronson, J. A., Nystrom, L. E., & Cohen, J. D. (2003). The neural basis of economic decision-making in the ultimatum game. Science, 300 (5626), 1755–1758; Civai, C., Crescentini, C., Rustichini, A., & Rumiati, R. I. (2012). Equality versus self-interest in the brain: Differential roles of anterior insula and medial prefrontal cortex. NeuroImage, 62 , 102–112.
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| a group of researchers from Cal Tech examined the neural responses Tricomi, E., Rangel, A., Camerer, C. F., & O’Doherty, J. P. (2010). Neural evidence for inequality-averse social preferences. Nature, 463 (7284), 1089–1091.
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| these are referred to as social rewards Lieberman, M. D., & Eisenberger, N. I. (2009). Pains and pleasures of social life. Science, 323 , 890–891.
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| Signs that others like, admire, and love us Baumeister, R. F., & Leary, M. R. (1995). The need to belong: Desire for interpersonal attachments as a fundamental human motivation. Psychological Bulletin, 117 (3), 497.
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| asked participants for permission to contact their friends Inagaki, T. K., & Eisenberger, N. I. (in press). Shared neural mechanisms underlying social warmth and physical warmth, Psychological Science .
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| looked at how rewarding these touching statements really were Castle, E., & Lieberman, M. D. (unpublished data). How much would you pay to hear “I love you”?
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| our reactions to getting this rarely shared positive feedback Guyer, A. E., Choate, V. R., Pine, D. S., & Nelson, E. E. (2012). Neural circuitry underlying affective response to peer feedback in adolescence. Social Cognitive and Affective Neuroscience, 7 (1), 81–92; Davey, C. G., Allen, N. B., Harrison, B. J., Dwyer, D. B., & Yücel, M. (2010). Being liked activates primary reward and midline self-related brain regions. Human Brain Mapping, 31 (4), 660–668.
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| participants in the scanner saw that strangers Izuma, K., Saito, D. N., & Sadato, N. (2008). Processing of social and monetary rewards in the human striatum. Neuron, 58 (2), 284.
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| praise taps into the same reinforcement system Baumeister, R. F., Campbell, J. D., Krueger, J. I., & Vohs, K. D. (2003). Does high self-esteem cause better performance, interpersonal success, happiness, or healthier lifestyles? Psychological Science in the Public Interest, 4 (1), 1–44.
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| Rewards can be divided Hull, C. L. (1952). A Behavior System: An Introduction to Behavior Theory Concerning the Individual Organism. New Haven: Yale University Press.
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| The red patch is not intrinsically rewarding Schultz, W., Dayan, P., & Montague, P. R. (1997). A neural substrate of prediction and reward. Science, 275 (5306), 1593–1599.
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| humans are supercooperators Melis, A. P., Semmann, D., Melis, A. P., & Semmann, D. (2010). How is human cooperation different? Philosophical Transactions of the Royal Society B: Biological Sciences, 365 (1553), 2663–2674; Nowak, M., & Highfield, R. (2012). SuperCooperators: Altruism, Evolution, and Why We Need Each Other to Succeed . New York: Free Press.
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| The principle of reciprocity is one of the strongest Cialdini, R. B. (2001). Influence: Science and Practice (Vol. 4). Boston: Allyn & Bacon; Burger, J. M., Sanchez, J., Imberi, J. E., & Grande, L. R. (2009). The norm of reciprocity as an internalized social norm: Returning favors even when no one finds out. Social Influence, 4 (1), 11–17.
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| By performing a small favor for you Regan, R. T. (1971). Effects of a favor and liking on compliance. Journal of Experimental Social Psychology, 7 , 627–639.
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| a game called the Prisoner’s Dilemma I highly recommend doing a YouTube search for “golden balls,” a British game show based on the Prisoner’s Dilemma. The top few hits are highly entertaining.
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| people still choose to cooperate Hayashi, N., Ostrom, E., Walker, J., & Yamagishi, T. (1999). Reciprocity, trust, and the sense of control: A cross-societal study. Rationality and Society, 11 (1), 27–46; Kiyonari, T., Tanida, S., & Yamagishi, T. (2000). Social exchange and reciprocity: Confusion or a heuristic? Evolution and Human Behavior, 21 (6), 411–427.
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| How can we explain why folks cooperate Kiyonari, T., Tanida, S., & Yamagishi, T. (2000). Social exchange and reciprocity: Confusion or a heuristic? Evolution and Human Behavior, 21 (6), 411–427.
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| “the first principle of economics Edgeworth, F. Y. (1881). Mathematical Psychics: An Essay on the Application of Mathematics to the Moral Sciences . London: Kegan Paul, p. 104.
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| “no other end, in all his actions Hume (1898/1754, p.117). Hume, D. (2001/1754). An Enquiry Concerning Human Understanding (Vol. 3). New York: Oxford University Press, p. 117.
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| “every man is presumed to seek Hobbes, T. (1969/1651). Leviathan ( part iii ). Aldershot, England: Scolar Press.
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| known as the axiom of self-interest Hollander, S. (1977). Adam Smith and the self-interest axiom. Journal of Law and Economics, 20 (1), 133–152.
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| What is surprising, though, is that Hayashi, N., Ostrom, E., Walker, J., & Yamagishi, T. (1999). Reciprocity, trust, and the sense of control: A cross-societal study. Rationality and Society, 11 (1), 27–46.
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| in addition to being self-interested Fehr, E., & Camerer, C. F. (2007). Social neuroeconomics: The neural circuitry of social preferences. Trends in Cognitive Sciences, 11 (10), 419–427.
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| people made decisions counter to their own self-interest Henrich, J., Boyd, R., Bowles, S., Camerer, C., Fehr, E., Gintis, H., … , & Tracer, D. (2005). “Economic man” in cross-cultural perspective: Behavioral experiments in 15 small-scale societies. Behavioral and Brain Sciences, 28 (6), 795–814.
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| “try to teach generosity and altruism Dawkins, R. (1976). The Selfish Gene . Oxford: Oxford University Press.
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| We know what the brain looks like Spitzer, M., Fischbacher, U., Herrnberger, B., Grön, G., & Fehr, E. (2007). The neural signature of social norm compliance. Neuron, 56 (1), 185–196; O’Doherty, J. P., Buchanan, T. W., Seymour, B., & Dolan, R. J. (2006). Predictive neural coding of reward preference involves dissociable responses in human ventral midbrain and ventral striatum. Neuron, 49 (1), 157.
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| in the minds of people as they cooperate or defect Rilling, J. K., Gutman, D. A., Zeh, T. R., Pagnoni, G., Berns, G. S., & Kilts, C. D. (2002). A neural basis for social cooperation. Neuron, 35 (2), 395–405.
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| ruling out long-term strategies like reputation building Rilling, J. K., Sanfey, A. G., Aronson, J. A., Nystrom, L. E., & Cohen, J. D. (2004). Opposing BOLD responses to reciprocated and unreciprocated altruism in putative reward pathways. Neuroreport, 15 (16), 2539–2243.
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| In Isaac Asimov’s book The End of the Eternity Asimov, I. (2010/1955). The End of Eternity . New York: Tor Books, pp. 117–118.
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| “Scratch an ‘altruist’ and watch a ‘hypocrite’ bleed” Ghiselin, M. T. (1974). The Economy of Nature and the Evolution of Sex (Vol. 247). Berkeley: University of California Press; Dawkins, R. (1976). The Selfish Gene . Oxford: Oxford University Press.
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| there may be a hidden selfish motivation Batson, C. D. (1991). The Altruism Question: Toward a Social-Psychological Answer . Hillsdale, NJ: Lawrence Erlbaum Associates, p. 116.
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| the psychological mechanism that motivates us to selflessly help Wilson, E. O. (2012). The Social Conquest of Earth . New York: Liveright.
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| what some call the warm glow of altruistic behavior Andreoni, J. (1990). Impure altruism and donations to public goods: A theory of warm-glow giving. Economic Journal, 100 (401), 464–477.
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| to be selfish, you should do it in a very intelligent way Lama, D. (1994). The Way to Freedom. New York: HarperCollins, p. 154.
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| an fMRI study looking at the activity in the brain Moll, J., Krueger, F., Zahn, R., Pardini, M., de Oliveira-Souza, R., & Grafman, J. (2006). Human fronto-mesolimbic networks guide decisions about charitable donation. Proceedings of the National Academy of Sciences, 103 (42), 15623–15628; Harbaugh, W. T., Mayr, U., & Burghart, D. R. (2007). Neural responses to taxation and voluntary giving reveal motives for charitable donations. Science, 316 (5831), 1622–1625.
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| the most selfish people on the planet: teenagers Telzer, E. H., Masten, C. L., Berkman, E. T., Lieberman, M. D., & Fuligni, A. J. (2010). Gaining while giving: An fMRI study of the rewards of family assistance among White and Latino youth. Social Neuroscience, 5 , 508–518.
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| examined supportive behavior between boyfriends and girlfriends Inagaki, T. K., & Eisenberger, N. I. (2012). Neural correlates of giving support to a loved one. Psychosomatic Medicine, 74 , 3–7.
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| our support of others could contribute significantly to our well-being Brown, S. L., Nesse, R. M., Vinokur, A. D., & Smith, D. M. (2003). Providing social support may be more beneficial than receiving it: Results from a prospective study of mortality. Psychological Science, 14 (4), 320–327.
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| Adam Smith, one of the founders of modern economics Smith, A. (1776). An Inquiry into the Nature and Causes of the Wealth of Nations . London: W. Strahan and T. Cadell.
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| “How selfish soever man may be supposed Smith, A. (1759). The Theory of Moral Sentiments . Edinburgh: A. Kincaid and J. Bell.
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| Many mammalian species have shown opioid-linked pleasure responses Keverne, E. B., Martensz, N. D., & Tuite, B. (1989). Beta-endorphin concentrations in cerebrospinal fluid of monkeys are influenced by grooming relationships. Psychoneuroendocrinology, 14 (1), 155–161.
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| in humans most of our grooming is verbal Dunbar, R. (1998). Theory of mind and the evolution of language. In J. Hurford, M. Studdart-Kennedy, & C. Knight (Eds.). Approaches to the Evolution of Language . Cambridge: Cambridge University Press, pp. 92–110.
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