Converging Minds: EEG Synchrony During Communication About Moral Decision-Making in Dyadic Interactions

Area of Science:

• Neuroscience
• Social Psychology
• Cognitive Science

Background:

• Moral decision-making involves intricate emotional and cognitive processes, particularly in critical scenarios.
• Understanding neural synchrony and asynchrony during social interactions is crucial for deciphering shared decision-making.

Purpose of the Study:

• To investigate neural convergence and divergence during moral negotiation using a hyperscanning paradigm.
• To explore electroencephalography (EEG) band dissimilarities in dyads discussing medical moral dilemmas.
• To examine the influence of Dominant Reasoning Profile (DRP) on neural dynamics during moral discussions.

Main Methods:

• Utilized a hyperscanning approach to simultaneously record EEG activity from 26 healthy young adults in 13 same-gender dyads.
• Participants engaged in discussions of a medical moral dilemma.
• Analyzed EEG band dissimilarities across frontal, temporo-central, and parieto-occipital regions, considering DRP categorization.

Main Results:

• Significantly greater dissimilarity in frontal delta-band activity was observed compared to parieto-occipital areas.
• This frontal dissimilarity persisted irrespective of the dyad's Dominant Reasoning Profile (DRP).
• Findings suggest differing emotional and motivational responses, indicating varied internalization of the moral decision-making process.

Conclusions:

• EEG hyperscanning is a valuable tool for studying neural mechanisms in social moral decision-making.
• Greater frontal dissimilarity may reflect divergent interpretations and internalizations of moral dilemmas between individuals.
• The study offers novel insights into dyadic brain dynamics during sensitive social negotiations.