The statistical analyses for the time-frequency CSD components at selected regions are summarized in Table 4. Alpha ERD at lateral centroparietal and parietal-occipital sites was significantly greater for target than novel stimuli (−0.97 ±1.49 vs. −0.54 ±1.12), and significantly reduced in patients compared to controls (−0.48 ±1.21 vs. −1.06 ±1.39). Furthermore, a highly significant main effect of hemisphere, stemming from right-greater-than-left alpha ERD (−0.90 ±1.38 vs. −0.61 ±1.26), was moderated by a robust interaction with group. Simple effects of hemisphere were highly significant in controls (F[1,38] = 22.9, p < .0001) but not patients (F[1,38] < 1.0), and simple effects of group were found for the right (F[1,38] = 8.43, p = .006) but not left hemisphere (F[1,38] = 2.75, p = .11). In contrast, no significant effects involving group or hemisphere were found for the two ERS factors, although ERS was more prominent for novel than target stimuli at mid-frontocentral sites (NVS ERS: 1.86 ±1.28 vs. 1.16 ±1.03) and at lateral frontocentral and temporoparietal sites (N1 ERS: 0.68 ±1.23 vs. 0.38 ±1.22).
