2012年3月7日水曜日

Impulse Control and Underlying Functions of the Left DLPFC Mediate Age-Related and Age-Independent Individual Differences in Strategic Social Behavior


Nikolaus Steinbeis, Boris C. Bernhardt, Tania Singer
Neuron, Volume 73, Issue 5, 1040-1051, 8 March 2012


戦略的行動の発達とその神経基盤。7-14歳の子供がMRI中で最後通牒ゲームと独裁者ゲームを行う。戦略的行動(両ゲームでの提案額の差)は年齢と正の相関があり、前頭前野外背側部(dlPFC)の活動及び大きさ(厚さ)で説明できる。 http://www.sciencedirect.com/science/article/pii/S0896627312000773

子供のfMRIも珍しいけど、行動データが面白い。戦略的行動の発達は公平性評価や他者信念予測能力では説明できないが、衝動性制御能力で説明できる。つまり、子供が戦略的に行動できないのは社会規範や他者の心を読めないからでなく、短期的利益追求の衝動を制御できないからである。


Human social exchange is often characterized by conflicts of interest requiring strategic behavior for their resolution. To investigate the development of the cognitive and neural mechanisms underlying strategic behavior, we studied children's decisions while they played two types of economic exchange games with differing demands of strategic behavior. We show an increase of strategic behavior with age, which could not be explained by age-related changes in social preferences but instead by developmental differences in impulsivity and associated brain functions of the left dorsolateral prefrontal cortex (DLPFC). Furthermore, observed differences in cortical thickness of lDLPFC were predictive of differences in impulsivity and strategic behavior irrespective of age. We conclude that egoistic behavior in younger children is not caused by a lack of understanding right or wrong, but by the inability to implement behavioral control when tempted to act selfishly; a function relying on brain regions maturing only late in ontogeny.

0 件のコメント:

コメントを投稿