Interpersonal alignment in infra-slow EEG rhythms and bodily signals anticipates mutual recognition

Dyads in a perceptual crossing hyperscanning interaction show enhanced 0.1 Hz infra-slow EEG power alignment during mutual recognition versus non-recognition trials.

• Why it matters: Slow EEG rhythms are thought to integrate autonomic and interoceptive processes into cognition, but their role in real-time social recognition is hard to measure.
• What they did: The study recorded infra-slow EEG with respiratory, cardiac, and skin conductance signals during a perceptual crossing experiment, comparing mutual-recognition trials to non-recognition while controlling for premovement motor potential.
• The result: Mutual recognition trials also differed in respiratory depth, cardiac vagal index, and skin conductance, suggesting 0.1 Hz infra-slow EEG may mark coupled brain–body coordination supporting shared understanding.

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