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Reward and Motivation

開催日 2014/9/12
時間 17:10 - 18:10
会場 Room H(304)
Chairperson(s) 松元 健二 / Kenji Matsumoto (玉川大学脳科学研究所 / Tamagawa University Brain Science Institute, Japan)
髙橋 英彦 / Hidehiko Takahashi (京都大学大学院医学研究科脳病態生理学講座精神医学教室 / Department of Psychiatry, Kyoto University Graduate School of Medecine, Japan)

Regional gray matter volume associated with general self-efficacy

  • O2-H-5-3
  • 杉浦 綾香 / Ayaka Sugiura:1,2 青木 隆太 / Ryuta Aoki:2,3,4 蓬田 幸人 / Yukihito Yomogida:3 松元 まどか / Madoka Matsumoto:3 村山 航 / Kou Murayama:5 出馬 圭世 / Keise Izuma:2,3,4 土師 知己 / Tomoki Haji:6 齋藤 慈子 / Atsuko Saito:1 長谷川 壽一 / Toshikazu Hasegawa:1 松元 健二 / Kenji Matsumoto:3 
  • 1:東京大院総合文化研生命環境科学 / Dept Life Sci, GSAS, Univ of Tokyo, Tokyo, Japan 2:日本学術振興会 / Japan Society for the Promotion of Sciences, Tokyo, Japan 3:玉川大脳研 / Brain Sci. Institute, Tamagawa Univ., Tokyo, Japan 4:Caltech, Pasadena, USA / Caltech, Pasadena, USA 5:University of Reading, Berkshire, UK / University of Reading, Berkshire, UK 6:ATR脳情報通信総合研脳解析研動的脳イメージング / Brain Activity Imaging Center, ATR-Promotions, Japan 

General self-efficacy is the strength of belief one has in one's own overall ability to successfully perform tasks, and general self-efficacy scores predict performance over time. We investigated the neural basis of individual differences in general self-efficacy by examining regional gray matter volume using voxel-based morphometry (VBM) analysis. This approach was chosen because general self-efficacy is a personality characteristic that is difficult to manipulate rapidly during a single experiment. Brain anatomy was analyzed using magnetic resonance images obtained from 64 healthy right handed participants (mean age = 20.1 ± 1.4 years, 29 males) who had completed Sherer's general self-efficacy scale. After controlling for the effects of age, sex, and total gray matter volume of each subject, results showed that regional gray-matter volume in the precuneus was significantly and positively correlated with general self-efficacy scores (z = 4.13, P = 0.001, cluster-level FWE corrected), and that the volume of a cluster in the left medial prefrontal cortex (mPFC), which is functionally and anatomically connected to the precuneus, followed the same trend (z = 4.87, P = 0.059; cluster-level FWE corrected). No similar association was seen between gray-matter volume and scores on other questionnaires(Self-esteem, BIS/BAS, Achievement motivation). Several separate studies show that recall of autobiographical information is associated with gray-matter volume in the precuneus and with general self-efficacy, and that depression is linked to both lower gray-matter volume in the mPFC and lower general self-efficacy. Here, our direct comparison is consistent with these results, and indicates that the gray matter volume in the precuneus and mPFC is related to individual differences in general self-efficacy.

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