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Understanding the neural mechanisms responsible for human social interactionsis difficult, since the brain activities of two or more individuals have to beexamined simultaneously and correlated with the observed social patterns. Weintroduce the concept of hyper-brain network, a connectivity patternrepresenting at once the information flow among the cortical regions of asingle brain as well as the relations among the areas of two distinct brains.Graph analysis of hyper-brain networks constructed from the EEG scanning of 26couples of individuals playing the Iterated Prisoner's Dilemma reveals thepossibility to predict non-cooperative interactions during the decision-makingphase. The hyper-brain networks of two-defector couples have significantly lessinter-brain links and overall higher modularity - i.e. the tendency to form twoseparate subgraphs - than couples playing cooperative or tit-for-tatstrategies. The decision to defect can be "read" in advance by evaluating thechanges of connectivity pattern in the hyper-brain network.

Defecting or not defecting: how to "read" human behavior during cooperative games by EEG measurements