Fig. 4.

Time course of interhemispheric auditory connectivity in the gamma-band (30–100 Hz) between bilateral auditory cortices (BA41 and BA42) during left ear (LE) reports for AVD/AVH (n = 9; red line) and non-AVD/AVH (n = 10; cyan line) subjects under ketamine (a) and under placebo (b) administration. Syllable presentation starts at 0 ms and ends around 500 ms. Shaded error bars: ±1 standard error. Gamma-band connectivity was significantly increased in the AVD/AVH group compared to the non-AVD/AVH group over time under ketamine administration: bar charts of mean lagged phase synchronization (LPS) during LE reports under ketamine (c) and under placebo (d) administration for AVD/AVH (n = 9) and non-AVD/AVH (n = 10; with error bars representing ±1 standard error). **p < 0.01; n.s. = not significant