Grand average ERP waveforms and scalp amplitude maps at P300 peak.

<p>Top panel (3A): grand average ERP waveforms from three midline electrodes (Fz, Cz, Pz) for standard stimuli (the thin grey line), target stimuli (the thick black line) and distracter stimuli (the grey line), with identification of distracter- and target-elicited P300 components. Data from controls and PD patients are shown on the left and the right, respectively. Bottom panel (3B): scalp amplitude maps at P300 peak latencies for the distracter (top) and target (bottom) stimuli. Data from healthy controls and PD patients are shown on the left and the right, respectively. Dots indicate electrode positions on the scalp.