A comprehensive picture of brain-to-brain interaction during eye contact is presented at the brain network level. It consists of five dyadic brain networks (two exogenous, two endogenous, and one exogenous-to-endogenous network), which are derived from a novel data-driven approach based on the dyadic fMRI data. Our experimental results not only explicitly map out the intricate relations between imitation, empathy, mentalization, and face cognization network during eye contact, but also provide a quantitative measure on the information transmission between dyads. Thus, it effectively established the foundation for quantifying human social communication with dyadic fMRI.
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