Figure 4.

Altered feedback effects during noncontinuous masker presentation. Two example neurons are shown for which masking noise was randomly presented only during vocalization in a subset of recordings instead of being presented continuously. A raster plot (A) and PSTH (B) show the response of a neuron weakly suppressed during unmasked phees (blue), but strongly excited during random masking (red). Masking-related responses began shortly after the onset of masker, indicated by green diamonds on raster plot in A (for individual vocalizations) and green dashed line on PSTH in B (for averaged response aligned by vocal onset). A second example neuron is shown in C and D, comparing vocal responses during unmasked (blue), continuous masking (black), and random masking conditions (red). Continuous masking response diverged from unmasked immediately at vocal onset, whereas random masking response increased shortly after masker onset before converging with the continuous masking response.