The statistical analyses for these CSD components at selected regions are summarized in Table 3, confirming the observed differences between target and novel stimuli across groups (Fig. 4). N1 sink at medial frontocentral sites (−1.23 ±0.99 vs. −1.00 ±1.09) and temporal N1 sink at lateral-temporal sites (−0.91 ±1.13 vs. −0.56 ±1.29) were larger for target than novel stimuli. In contrast, novelty MMN (0.36 ±0.91 vs. −0.86 ±1.59) and NVS (0.31 ±1.24 vs. 1.58 ±2.04) at mid-frontocental sites were effectively present for novel sounds but not for target tones (see also Fig. 3). Likewise, the mid-frontocental portion of factor 350 (P3a) was more robust for novel (1.00 ±1.20) than target (0.39 ±1.07) stimuli, whereas the mid-parietal portion of factor 350 (P3b) did not differ between these two conditions. Lastly, factor 505 revealed robust condition effects in favor of target compared to novel stimuli, with greater FRN sink at mid-frontal sites (−1.96 ±1.24 vs. −1.11 ±1.18) and greater FRN source at centroparietal sites (1.22 ±1.03 vs. 0.67 ±0.72).
