Prevocal suppression and γ activity. A, B, MUA and γ responses of an example auditory cortex site in which suppression began before the onset of vocalization. Induced γ was similarly increased in the prevocal period for this unit (up to 200 ms before vocal onset, B). C, Population histogram of induced (blue) and evoked (red) activity in the 250 ms prevocal period. Only a fraction of sites showed increases in prevocal induced γ power (15.8%), whereas a number showed decreased prevocal evoked power (34.2%). D, Raster plot showing a correlation between prevocal and vocal induced γ power (r = 0.44, p < 0.001; slope 0.95, 95% CI [0.84, 1.06]). E, Raster plot showing inverse correlation of prevocal induced γ power and prevocal MUA responses (r = −0.28, p < 0.001), which is a positive correlation between γ responses and vocal suppression.