title: Cooperative context is a determinant of the social influence on outcome evaluation: An electrophysiological study.
abstract: The present study examined whether or not a cooperative context is a determinant of the social influence on the evaluation of two action outcomes: a monetary outcome and a conflict of opinion with other group members. In the present study, three-person groups were randomly assigned to be either a cooperative or individual group and asked to perform a gambling task. The monetary outcomes in the cooperative group were interrelated among group members, whereas those in the individual group did not influence each other. The present results showed that monetary outcomes elicited feedback-related negativity (FRN) and a conflict of opinion with other group members elicited FRN-like negativity, which reflect an evaluation of the motivational significance of action outcomes. The FRN elicited by monetary outcomes was reduced when participants shared decisions with other group members only in the cooperative group, indicating that the cooperative context reduced the motivational significance of monetary outcomes through the diffusion of responsibility. The FRN-like negativity elicited by a conflict of opinion showed a different pattern between the cooperative and individual groups, indicating that the cooperative context can influence the evaluation of a conflict of opinion, possibly via the modulation of group cohesiveness or conflict processing. The present results suggest that a cooperative context, rather than the social setting, is a determinant of the social influence on outcome evaluation.
authors.affiliation: Center for Applied Psychological Science, Kwansei Gakuin University, Nishinomiya 662-8501, Japan; Physiological Function Research Team, Automotive Human Factors Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8566, Japan. Electronic address: kenta.kimura@aist.go.jp.
authors.forename: Kenta
authors.initials: K
authors.lastname: Kimura
authors.affiliation: Center for Applied Psychological Science, Kwansei Gakuin University, Nishinomiya 662-8501, Japan; Department of Psychological Science, Kwansei Gakuin University, Nishinomiya 662-8501, Japan.
authors.forename: Jun'ichi
authors.initials: J
authors.lastname: Katayama
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D002755:Choice Behavior / Q000502:physiology; D003299:Cooperative Behavior; D004569:Electroencephalography; D004585:Electrooculography; D005071:Evoked Potentials / Q000502:physiology*; D025461:Feedback, Physiological / Q000502:physiology; D005260:Female; D005717:Games, Experimental; D006801:Humans; D007398:Interpersonal Relations; D008297:Male; D055815:Young Adult
keywords: Cooperative context; FRN; Feedback processing; Outcome evaluation; Social context