| 研究実績の概要 |
People make various decisions every day. From what to eat, where to visit for vacation, which job offer to take, and so on. Social information, no doubt, has a certain degree of influence on the decisions we make. The impact of social information also exists when people perform perceptual decision-making tasks, as Asch showed in his essential works in the 1950s. A question has been raised but remains unanswered: when people change their answers in perceptual decision-making tasks after receiving social information, does the perceptual representation in the brain change along with their behavioral responses? We combined functional MRI and multivoxel pattern analysis (MVPA) to tackle this issue.
Results indicated that, participants changed their answers to agree with partner’s answers more frequently than when they changed their response to agree with random answers. This result indicates that participants did involve social information for visual perceptual decision making in this task. Furthermore, the classifier successfully classified the brain pattern of the first stimuli and that of the second stimuli when participants changed their answers to agree with partner’s answers. The result suggests that social information may be able to alter people's visual perception.
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