Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 113, Issue 35, Pages 9763-9768Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1603198113
Keywords
reinforcement learning theory; prosocial behavior; empathy; reward; subgenual anterior cingulate cortex
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Funding
- Medical Research Council
- Birkbeck-University College London Centre for Neuroimaging
- Biotechnology and Biological Sciences Research Council [BB/M013596/1]
- Biotechnology and Biological Sciences Research Council [BB/M013596/1] Funding Source: researchfish
- Medical Research Council [1069029] Funding Source: researchfish
- BBSRC [BB/M013596/1] Funding Source: UKRI
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Reinforcement learning theory powerfully characterizes how we learn to benefit ourselves. In this theory, prediction errors-the difference between a predicted and actual outcome of a choice-drive learning. However, we do not operate in a social vacuum. To behave prosocially we must learn the consequences of our actions for other people. Empathy, the ability to vicariously experience and understand the affect of others, is hypothesized to be a critical facilitator of prosocial behaviors, but the link between empathy and prosocial behavior is still unclear. During functional magnetic resonance imaging (fMRI) participants chose between different stimuli that were probabilistically associated with rewards for themselves (self), another person (prosocial), or no one (control). Using computational modeling, we show that people can learn to obtain rewards for others but do so more slowly than when learning to obtain rewards for themselves. fMRI revealed that activity in a posterior portion of the subgenual anterior cingulate cortex/basal forebrain (sgACC) drives learning only when we are acting in a prosocial context and signals a prosocial prediction error conforming to classical principles of reinforcement learning theory. However, there is also substantial variability in the neural and behavioral efficiency of prosocial learning, which is predicted by trait empathy. More empathic people learn more quickly when benefitting others, and their sgACC response is the most selective for prosocial learning. We thus reveal a computational mechanism driving prosocial learning in humans. This framework could provide insights into atypical prosocial behavior in those with disorders of social cognition.
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