2014年5月1日木曜日

The Brain's Temporal Dynamics from a Collective Decision to Individual Action

Caroline J. Charpentier, Christina Moutsiana, Neil Garrett, and Tali Sharot
The Journal of Neuroscience, 23 April 2014, 34(17):5816-5823;

多数派の選択に同調して自分の意見/選好/選択を変える際の脳活動。
「多数派の選択を観察した」際の眼窩前頭皮質の活動と「その自分の選択を行う」際の活動が似ている人ほど多数派同調を行う。

Social animals constantly make decisions together. What determines if individuals will subsequently adjust their behavior to align with collective choices? Here, using functional magnetic resonance imaging in humans, we characterize a novel temporal model of brain response from the time a collective decision is made to the time an individual action is required. We reveal that whether a behavioral modification will occur is determined not necessarily by the brain's response to the initial social influence, but by how that response (specifically in the orbitofrontal cortex; OFC) is mirrored at a later time when the individual selects their own action. This result suggests that the OFC may reconstitute an initial state of collective influence when individual action is subsequently needed. Importantly, these dynamics vary across individuals as a function of trait conformity and mediate the relationship between this personality characteristic and behavioral adjustment toward the group.

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