Outcome evaluations in group decision-making using authority rule: An electrophysiological study
Kenta Kimura1, Hiroki Sawada2, Jun'ichi Katayama3
1National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan.
Neuropsychologia
|September 7, 2018
Summary
Opinion agreement influences how groups process outcomes, impacting brain responses like feedback-related negativity (FRN). This effect persists even when leaders make final decisions under authority.
Area of Science:
- Neuroscience
- Social Psychology
- Cognitive Science
Background:
- Group decision-making involves complex social dynamics and cognitive processes.
- Understanding how opinion congruence affects outcome evaluation is crucial for optimizing group performance.
- Event-related brain potentials (ERPs), such as feedback-related negativity (FRN), offer insights into neural mechanisms of outcome processing.
Purpose of the Study:
- To investigate the impact of opinion coincidence on the evaluative processing of outcomes in group decision-making.
- To examine the relationship between opinion congruence and feedback-related negativity (FRN) under an authority rule.
- To determine if opinion coincidence influences outcome evaluation differently for leaders and followers.
Main Methods:
- Utilized a group decision-making task involving three-person groups with designated leader and follower roles.
- Measured feedback-related negativity (FRN), an event-related brain potential (ERP), in response to monetary gains or losses.
- Classified trials into unanimous, majority, or minority opinion conditions to analyze the effect of opinion coincidence.
Main Results:
- The amplitude of FRN was significantly smaller for unanimous trials compared to majority trials in leader decision blocks.
- In follower blocks, the amplitude of FRN was larger for majority trials than for minority trials.
- These findings indicate that opinion coincidence modulates the neural processing of outcomes in group settings.
Conclusions:
- Coincidence of opinion significantly affects the evaluative processing of outcomes during group decision-making.
- The observed effects of opinion congruence on outcome evaluation are present even when authority structures clearly define roles.
- Neural responses, specifically FRN, reflect the influence of shared opinions on how individuals evaluate group outcomes.
Keywords:
Evaluative processingEvent-related brain potential (ERP)Feedback-related negativity (FRN)Group decision-makingReward positivity (RewP)More Related Videos
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