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Results of a permutation test comparing the true log odds (β = 0.066) of the association between eye contact and pupillary synchrony to: 1) 5,000 permutations shuffling dyads eye contact and pupillary synchrony time series, and 2) 5,000 permutations shuffling eye contact time series within each dyad. The true relationship between pupillary synchrony and eye contact fell significantly outside these two distributions.
