Fig. 4.

Song-locked rate modulations of LMAN neurons are reduced in lesion birds. CVs of the motif-aligned rate histogram (A), mean cross-trial correlations in spike trains (B), and within-trial CVs of instantaneous firing rates (C) of LMAN neurons were lower in lesion birds (red, lesion-deaf; purple, lesion-hearing) than in intact birds (black). In B, filled circles indicate a significant difference from correlations computed from time-shuffled spike-trains (Materials and Methods). *P < 0.05; **P < 0.01.