Two-way repeated measures ANOVA with PLI as dependent variable revealed a significant main effect of Tone in the delta, theta and alpha/beta frequency bands in the parietal cortices, when collapsing across P and NP groups (Table 2). Post hoc pairwise comparisons showed lower PLI in response to standard tones (vs. rare and noise tones) in the parietal delta and theta bands. Lower PLI in response to rare tones (vs. noise tones) was also found in the parietal alpha/beta band (Table 2).