2013年11月14日木曜日

Changing Social Norm Compliance with Noninvasive Brain Stimulation

C. C. Ruff, G. Ugazio, E. Fehr,
Science 25 October 2013: Vol. 342 no. 6157 pp. 482-484

ヒトの「社会規範の遵守」の神経基盤。
tDCSによって「右前頭前野背外側部(rDLPFC)」を刺激すると、被験者の「社会規範遵守に関する行動」が変化する。
一方、社会規範に関する「判断」は変わらない。

All known human societies have maintained social order by enforcing compliance with social norms. The biological mechanisms underlying norm compliance are, however, hardly understood. We show that the right lateral prefrontal cortex (rLPFC) is involved in both voluntary and sanction-induced norm compliance. Both types of compliance could be changed by varying the neural excitability of this brain region with transcranial direct current stimulation, but they were affected in opposite ways, suggesting that the stimulated region plays a fundamentally different role in voluntary and sanction-based compliance. Brain stimulation had a particularly strong effect on compliance in the context of socially constituted sanctions, whereas it left beliefs about what the norm prescribes and about subjectively expected sanctions unaffected. Our findings suggest that rLPFC activity is a key biological prerequisite for an evolutionarily and socially important aspect of human behavior.

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