北山特任教授、柳澤助教、内田准教授、阿部准教授の共著論文が『PNAS』に掲載されました
北山忍特任教授、柳澤邦昭助教、内田由紀子准教授、阿部修士准教授らの共著論文 “Reduced orbitofrontal cortical volume is associated with interdependent self-construal” が、『PNAS (Proceedings of the National Academy of Sciences)』に掲載されました。
本研究では、他者との人間関係の中に埋め込まれた存在として自己をとらえる「相互協調的自己観」とよばれる東アジア圏で優勢な文化的自己観と、脳構造との対応関係を調べたものです。脳構造の解析では、灰白質の容量を評価可能なvoxel-based morphometry（VBM）の手法を用いました。解析の結果、相互協調的自己観が強い個人ほど、眼窩前頭皮質とよばれる領域の灰白質量が低いことがわかりました。さらにこの関係性は、物体の視覚的特徴をもとにした情報処理である「物体イメージ型」の認知スタイルが強い場合に顕著でした。この研究はこころの未来研究センター連携MRI研究施設のMRIを用いて行われました。
Kitayama S, Yanagisawa K, Ito A, Ueda R, Uchida Y, Abe N (2017)Reduced orbitofrontal cortical volume is associated with interdependent self-construal
Proceedings of the National Academy of Sciences of the United States of America 114 (30): 7969-7974
http://www.pnas.org/content/114/30/7969.abstract ※認証有り
●Abstract
Interdependent self-construal refers to a view of the self as embedded in relationships with others. Prior work suggests that this construal is linked to a strong value placed on social obligations and duties. Interdependent people are therefore cognitively attuned to others and various social events in their surroundings while down-regulating their personal goals. In the present work, we examined whether structural properties of the brain predict interdependent self-construal. We performed a structural magnetic resonance imaging on 135 Japanese young adults while assessing (i) independent and interdependent self-construals and (ii) the degree to which individuals form vivid images of external objects (object imagery). The cortical volume of the orbitofrontal cortex (OFC) (a core cortical region responsible for value-based decisionmaking and, thus, inherently involved in personal goals and desires) inversely predicted interdependent self-construal. Further analysis found that the highest level of interdependent self-construal is achieved when those who are relatively low in the OFC volume are simultaneously high in object imagery, consistent with previous evidence that interdependence, as realized via obligation and duty, requires both the reduced self-interest and vigilant cognitive attunement to environmental context.
KEYWORDS: interdependence, orbitofrontal cortex, self-construal, voxel-based morphometry
2017/09/06