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Articles, Behavioral/Cognitive

Computational Substrates of Norms and Their Violations during Social Exchange

Ting Xiang, Terry Lohrenz and P. Read Montague
Journal of Neuroscience 16 January 2013, 33 (3) 1099-1108; DOI: https://doi.org/10.1523/JNEUROSCI.1642-12.2013
Ting Xiang
1Department of Neuroscience, Baylor College of Medicine, Houston, Texas 77030,
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Terry Lohrenz
2Virginia Tech Carilion Research Institute and Department of Physics, Virginia Tech, Roanoke, Virginia 24016, and
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P. Read Montague
2Virginia Tech Carilion Research Institute and Department of Physics, Virginia Tech, Roanoke, Virginia 24016, and
3Wellcome Trust Centre for Neuroimaging, London, WC1N 3BG, United Kingdom
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Abstract

Social norms in humans constrain individual behaviors to establish shared expectations within a social group. Previous work has probed social norm violations and the feelings that such violations engender; however, a computational rendering of the underlying neural and emotional responses has been lacking. We probed norm violations using a two-party, repeated fairness game (ultimatum game) where proposers offer a split of a monetary resource to a responder who either accepts or rejects the offer. Using a norm-training paradigm where subject groups are preadapted to either high or low offers, we demonstrate that unpredictable shifts in expected offers creates a difference in rejection rates exhibited by the two responder groups for otherwise identical offers. We constructed an ideal observer model that identified neural correlates of norm prediction errors in the ventral striatum and anterior insula, regions that also showed strong responses to variance-prediction errors generated by the same model. Subjective feelings about offers correlated with these norm prediction errors, and the two signals displayed overlapping, but not identical, neural correlates in striatum, insula, and medial orbitofrontal cortex. These results provide evidence for the hypothesis that responses in anterior insula can encode information about social norm violations that correlate with changes in overt behavior (changes in rejection rates). Together, these results demonstrate that the brain regions involved in reward prediction and risk prediction are also recruited in signaling social norm violations.

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The Journal of Neuroscience: 33 (3)
Journal of Neuroscience
Vol. 33, Issue 3
16 Jan 2013
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Computational Substrates of Norms and Their Violations during Social Exchange
Ting Xiang, Terry Lohrenz, P. Read Montague
Journal of Neuroscience 16 January 2013, 33 (3) 1099-1108; DOI: 10.1523/JNEUROSCI.1642-12.2013

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Computational Substrates of Norms and Their Violations during Social Exchange
Ting Xiang, Terry Lohrenz, P. Read Montague
Journal of Neuroscience 16 January 2013, 33 (3) 1099-1108; DOI: 10.1523/JNEUROSCI.1642-12.2013
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