When the ANOVA model was restricted to patients (i.e., responders vs. nonresponders), the Condition × Response Group effect was prominent (F[1, 36] = 7.86, p = .008 ), and a Response Group effect attained significance (F[1, 36] = 4.71, p = .037), but the Age effects did not. Response Group did not interact with Alpha Frequency (low vs. high), and no significant Condition × Response Group effect was observed for separate ANOVA models for low- and high-alpha factors, suggesting that the alpha reduction in nonresponders is a shared property that is maximal for eyes-closed and cuts broadly across alpha subbands (Section S3 in the Supplement).
