Journal
NEURON
Volume 35, Issue 2, Pages 395-405Publisher
CELL PRESS
DOI: 10.1016/S0896-6273(02)00755-9
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Funding
- NIDA NIH HHS [DA00367] Funding Source: Medline
- NIGMS NIH HHS [T32 GM008169] Funding Source: Medline
- NIMH NIH HHS [MH61010] Funding Source: Medline
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Cooperation based on reciprocal altruism has evolved in only a small number of species, yet it constitutes the core behavioral principle of human social life. The iterated Prisoner's Dilemma Game has been used to model this form of cooperation. We used fMRI to scan 36 women as they played an iterated Prisoner's Dilemma Game with another woman to investigate the neurobiological basis of cooperative social behavior. Mutual cooperation was associated with consistent activation in brain areas that have been linked with reward processing: nucleus accumbens, the caudate nucleus, ventromedial frontal/orbitofrontal cortex, and rostral anterior cingulate cortex. We propose that activation of this neural network positively reinforces reciprocal altruism, thereby motivating subjects to resist the temptation to selfishly accept but not reciprocate favors.
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