Outcome evaluations in group decision making using the majority rule: an electrophysiological study

Area of Science:

• Neuroscience
• Cognitive Psychology
• Social Psychology

Background:

• The feedback-related negativity (FRN) is an event-related brain potential (ERP) associated with outcome evaluation.
• Understanding how group dynamics influence individual decision-making and outcome evaluation is crucial.
• The impact of the majority rule on cognitive processes during group tasks requires further investigation.

Purpose of the Study:

• To examine the evaluative processing of outcomes in group decisions using the majority rule.
• To investigate how the majority rule affects the evaluation of conflicts arising from individual opinions within a group.
• To analyze the neural correlates (ERPs) of these processes, specifically the FRN.

Main Methods:

• Recorded event-related brain potentials (ERPs) from three participants during a group decision task.
• Utilized a group decision task incorporating the majority rule.
• Analyzed the feedback-related negativity (FRN) in response to different outcome types and opinion alignments.

Main Results:

• FRN amplitude for monetary loss in group decisions was reduced when the participant's opinion was in the minority.
• Conflict among group members' opinions elicited an FRN-like negativity.
• Greater FRN-like negativity amplitudes were observed when the participant's opinion was in the minority during conflict.

Conclusions:

• The majority rule significantly modulates outcome evaluations during group decision-making.
• Individual opinions being in the minority can alter the neural processing of negative outcomes and conflicts.
• These findings highlight the interplay between social influence and cognitive evaluation in group contexts.