This work was supported by MEXT (The Ministry of Education, Culture, Sports, Science and Technology, Japan)—Supported program for the Strategic Research Foundation at Private Universities (2010-2014) to the Center for Applied Psychological Science (CAPS), Kwansei Gakuin University.
Outcome evaluations in group decision making using the majority rule: An electrophysiological study
Article first published online: 12 JUN 2013
Copyright © 2013 Society for Psychophysiological Research
Volume 50, Issue 9, pages 848–857, September 2013
How to Cite
Kimura, K. and Katayama, J. (2013), Outcome evaluations in group decision making using the majority rule: An electrophysiological study. Psychophysiology, 50: 848–857. doi: 10.1111/psyp.12068
- Issue published online: 15 AUG 2013
- Article first published online: 12 JUN 2013
- Manuscript Accepted: 7 APR 2013
- Manuscript Received: 9 NOV 2012
- Strategic Research Foundation at Private Universities
- Majority rule;
- Social learning;
- Outcome evaluation;
Event-related brain potential (ERP) reflecting outcome evaluation is called feedback-related negativity (FRN). The present study examined the evaluative processes for two different types of outcomes by recording ERPs from three participants during a group decision task. First, we examined the evaluative processing of outcomes associated with group decisions using the majority rule. Second, we investigated whether the majority rule influenced the evaluation of conflicts related to individual opinions among group members. We found that FRN for monetary loss associated with the group decision was reduced when the participant's opinion was in the minority. In addition, conflict of opinions among group members elicited FRN-like negativity, and greater amplitudes were observed when the participant's opinion was in the minority. The present results suggested that the majority rule can modulate outcome evaluations in group decision making.