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演題詳細

Poster

動機づけ・情動
Motivation and Emotion

開催日 2014/9/11
時間 16:00 - 17:00
会場 Poster / Exhibition(Event Hall B)


Neural mechanisms of integrating others’ outcomes to make one’s own decisions

  • P1-228
  • 福田 玄明 / Haruaki Fukuda:1,2 Suzuki Shinsuke / Shinsuke Suzuki:1,3,4 Ma Ning / Ning Ma:1 Harasawa Norihiro / Norihiro Harasawa:1 Ueno Kenichi / Kenichi Ueno:5 Gardner Justin L / Justin L Gardner:6 Ichinohe Noritaka / Noritaka Ichinohe:7 Haruno Masahiko / Masahiko Haruno:8 Cheng Kang / Kang Cheng:5,9 Nakahara Hiroyuki / Hiroyuki Nakahara:1 
  • 1:独立行政法人理化学研究所 / Lab For Int Theor Neurosci, RIKEN BSI, Japan 2:Dept of Gen Syst Studies, Univ of Tokyo, Japan / Dept of Gen Syst Studies, Univ of Tokyo, Japan 3:Div of Humanities & Social Sci, Caltech, CA, USA / Div of Humanities & Social Sci, Caltech, CA, USA 4:JSPS fellow, Grad School of Letters, Hokkaido University / JSPS fellow, Grad School of Letters, Hokkaido University 5:MRI Support Unit, RIKEN BSI, Japan / MRI Support Unit, RIKEN BSI, Japan 6:Lab for Human Systems Neuroscience, RIKEN BSI, Japan / Lab for Human Systems Neuroscience, RIKEN BSI, Japan 7:Dept of Ultrastructural Res, Natl Inst of Neurosci, NCNP, Japa / Dept of Ultrastructural Res, Natl Inst of Neurosci, NCNP, Japan 8:Center for Info and Neural Networks, NICT, Japan / Center for Info and Neural Networks, NICT, Japan 9:Lab for Cognitive Brain Mappin / Lab for Cognitive Brain Mapping, RIKEN BSI, Japan 

Decision-making can be based on the expectation of self rewards as well as the decisions' consequence to others' rewards. A fundamental question in social cognition is what the underlying neural mechanisms are. In this study, we addressed this issue, devising a novel experimental task and combining human fMRI with computational modeling. Our task is composed of three types of trials: Control, Charity and Bonus. Control trials served as baseline, i.e., value-based decision-making to choose one of two options (for self reward), whereas Charity and Bonus trials involved an additional reward to either option: charity and bonus (to others and the self, respectively). Behaviorally, we found that the influence by charity value on subjects' choice behavior is characterized as an addendum to the original self-reward expectation, still weaker than the influence by the same face value of bonus. Using model-based fMRI analysis, we found that the signals in temporoparietal junction are significantly correlated with charity value, but not with bonus value. The signals in prefrontal cortex (ventromedial prefrontal cortex and frontal pole in particular) are significantly correlated with decision value in Control trials. Notably, when the decision value is summation of the original value with charity and bonus value, the signals in the same region indicated distinct modulations. These results indicate that neural signals for reward to others are distinct from those for additional reward to the self, not only in first stage but also in final stage of making decisions. This suggests a fundamental distinction in reward of the self and others for making decisions.

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