Activity in auditory cortex and STS during passive listening. (A) Time–frequency plots of responses to CV syllables /ba/, /da/, /ga/, /pa/, /ta/, and /ka/, averaged across all recording sites in each of the five ROIs (rows). Stimulus schematic is shown on top in gray. Dotted rectangles denote the time window used for the quantitative analyses of gamma and alpha ERBP (black: 50–350 ms, 30–150 Hz; magenta: 350–650 ms, 8–14 Hz). (B) Distribution of gamma ERBP values across sites and percentages of sites with significant (P < 0.05) gamma responses in each ROI (top and bottom panel, respectively). Magnitude and prevalence of gamma responses in the STS during the active task is replotted from Figure 4 in a darker shade of gray for comparison. (C) Distribution of alpha ERBP values across sites and percentages of sites with significant (P < 0.05) alpha suppression in each ROI (top and bottom panel, respectively). Magnitude and prevalence of alpha suppression in the STS during the active task is replotted from Figure 4 in a darker shade of gray for comparison. In each violin plot, circle denotes the median, horizontal line denotes the mean, bar denotes Q₁ and Q₃, and whiskers show the range of lower and higher adjacent values. Statistical significance of differences was established using LME models with ROI as the fixed effect and subject as the random effect. Statistical significance of response prevalence differences was established using Fisher exact tests.