Discovery Sagaサイレントキーワード俯瞰

social influence / conformity / perception / social information / fMRI / decoding

The main goal of the present study was to answer this question. In the present study, we collected fMRI data while participants were performing a modified random dot motion task. The experimental setting and the instruction lured them into believing that their task and their partner's task were synchronised. Therefore, we were able to show them partner's answer to each stimulus. Participants observed the same stimulus twice and made the judgements twice as well. One stimulus appeared before, and another one appeared after receive the partner's answer or the random answer. We trained classifier to identify neural patterns in V1, V2, V3, and MT while each pattern corresponds to one moving direction participants perceived and then used the classifier to test whether neural patterns were the same or different in trials when participants showed conformity to partner or to random answer. The results showed that when participants change their answer from 'moving right' to 'moving left', the neural patterns in V1, V3 and MT changed from the 'right pattern' to the 'left pattern', and vice versa. Therefore, our results suggest that one of the reasons why people show social conformity in a visual perception task is because social influence penetrate early perception processes, and it makes people perceive differently.

神経美学 / 脳認知科学 / 美 / 眼窩前頭皮質 / fMRI / 潜在的評定 / デコーディング / 感性認知 / 美的評価 / 選好判断 / 潜在評価

本研究は,機能的磁気共鳴画像(fMRI)を用いて,「美しさ」の価値表象の発現に関与する脳の働きについて,特に眼窩前頭皮質や側座核といった報酬系メカニズムとの関わりで検討した。絵画画像や顔画像,商品画像などの様々な視覚刺激をMRI内にいる実験参加者に提示し,それらに対する美しさの度合いの評定や,対提示される2つの画像のうちどちらがより美しいかを問う判断をしている時の脳の活動から,報酬系メカニズムの部位の詳細と判断や反応との対応関係を明らかにすることができた。