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(a) Grand-average ERPs evoked by outcome valence (presented antecedently), and (b) that evoked by outcome magnitude (presented subsequently) using a 2 Hz low-pass filter. Both were observed at the CPz recording site. The time point “0” indicates the outcome presentation onset. The light gray shaded areas indicate the 200–600 ms analysis window for the P3. The scalp topographies of each condition are presented beneath.
