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(top) Scalp topographies depicting the error minus correct amplitude difference from 0–100 ms post-response, shown separately for Controls (left), PTSD-AUD (middle) and PTSD+AUD (right) groups. (bottom) Response-locked ERP waveforms at Cz showing error and correct trial (and difference) waveforms for Controls (left), PTSD-AUD (middle) and PTSD+AUD (right) groups. For each panel, response onset occurred at 0 ms and negative amplitude is plotted up.
