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ERP waveforms at Pz (left) and scalp distribution (right) for the probe P300 across the different conditions. Data were collapsed across the countdown and interstimulus interval phases of each condition and the shock and unpleasant picture trials. The shaded regions shows the segment (260 to 320 ms) where the P300 was scored. CD = countdown; ERP = event-related potential; ISI = interstimulus interval; ms = milliseconds; N = no threat; P = predictable threat; U = unpredictable threat.
