Elevated Inter-Brain Coherence Between Subjects With Concordant Stances During Discussion of Social Issues

Area of Science:

• Neuroscience
• Social Psychology
• Communication Studies

Background:

• Social media platforms significantly influence public perception and behavior.
• Understanding the motivations and neural dynamics behind information spread is crucial.
• Existing research lacks insight into the inter-brain dynamics of group discussions influenced by social media.

Purpose of the Study:

• To investigate the effects of social media messaging and in-person discussion on inter-brain dynamics within small groups.
• To explore the psychophysiological impact of information campaigns and narrative messaging.
• To analyze neural correlates of agreement and disagreement during social issue debates.

Main Methods:

• Utilized 24-channel wireless electroencephalography (EEG) to measure brain activity.
• Collected data from groups of 3-4 participants debating controversial social issues.
• Analyzed inter-brain coherence using concordance, agreement/disagreement, and group unanimity metrics.

Main Results:

• Subject pairs who agreed on social issues exhibited significantly greater inter-brain coherence in the gamma frequency range.
• This effect was amplified in groups with unanimous stances on certain scenarios.
• Cortical regions involved in social interaction showed heightened coherence during agreement.

Conclusions:

• Inter-brain coherence, particularly in the gamma frequency, is a neural marker of social agreement.
• Social media and group discussions can modulate these neural synchronies.
• Findings suggest potential scenario-specific effects on inter-brain coherence, warranting further investigation.