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Left: amplitude of VEP difference scores (repetition—alternation trials) in response to viewing neutral, angry or pained facial expressions in experiment 1. Positive waveforms indicate higher VEP amplitudes in repeated relative to alternated trials while negative waveforms indicate repetition suppression of the VEP in repeated relative to alternated trials. Right: box plots highlighting the significant suppression of VEP amplitude to repeating angry faces (whiskers represent s.d.).
