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Variance in P200 for fear face stimuli not attributable to variability in the neutral face condition. Representative residual P200 amplitudes for MZ twins (left) and DZ twins (right). Concordances for P200 amplitudes remained higher for MZ (intraclass r for Fear faces minus Neutral =.28, p<.023) than for DZ twins (Fear-Neutral: r= −.04, p<.61). Difference in concordance for Mz versus Dz twins achieved significance (p<.05).
