N1 amplitude did not differ between HC and SZ (F1,51=0.025, p=0.876). As for P1 amplitude, a main effect of Hemisphere (F1,51=46.187, P<0.001) was found, indicating that N1 amplitude was greater over contralateral than ipsilateral electrodes, as expected. However, again as for P1 amplitude, there was no significant Diagnosis × Hemisphere interaction (F1,51=1.498, p=0.227). There was a significant main effect of Electrode (F3,153=12.364, p<0.001), and there was also a significant Electrode × Hemisphere interaction (F3,153=5.960, p=0.001), indicating that the electrode pairs differed in terms of the magnitude of the N1 contralaterality effect, which was maximal at the PO7/PO8 electrode pair and minimal at the PO9/PO10 electrode pair The Diagnosis × Electrode interaction was also significant (F3,153=3.368, p=0.014), which was primarily due to the SZ showing non-significantly decreased N1 amplitudes at the P5/P6 electrode pair (F1,51=2.230, p=0.142) but non-significantly increased N1 amplitudes at the PO9/PO10 electrode pair (F1,51=1.709, p=0.197), relative to the HC. There were no other significant main effects or interactions.
