An interaction-centric approach for quantifying eye-to-eye reciprocal interaction.

Area of Science:

• Neuroscience
• Social Neuroscience
• Cognitive Neuroscience

Background:

• Traditional spectator models limit understanding of real-time brain-to-brain interactions.
• Investigating dyadic brain activity during social engagement, like eye contact, is crucial for understanding social cognition.

Purpose of the Study:

• To present an interaction-centric framework for analyzing brain-to-brain dynamics during eye contact.
• To move beyond spectator models by quantifying emergent interactive brain states.
• To characterize agentic interaction by differentiating sensory and mind-based components.

Main Methods:

• Utilized hyperscanning functional Magnetic Resonance Imaging (fMRI) to capture simultaneous brain activity during eye contact.
• Differentiated BOLD (Blood-Oxygen-Level-Dependent) responses into reciprocal (eye-to-eye) and non-reciprocal (eye-to-face) communication.
• Quantified reciprocal fMRI responses into an interaction matrix, identified communication channels using Correspondence Analysis, and measured information flow with Mutual Information.

Main Results:

• The interactor approach successfully identified emergent dyadic brain states not detectable by spectator models.
• Analysis revealed distinct sensory-based (exogenous) and mind-based (endogenous) components of reciprocal interaction.
• Application to parent-child eye contact confirmed developmental findings and uncovered novel insights into social engagement's impact on brain function.

Conclusions:

• The proposed interactor approach offers a powerful new framework for studying brain-to-brain dynamics.
• This method enhances our understanding of how reciprocal social engagement shapes neural processes.
• The findings have implications for developmental neuroscience and the study of social interaction.