FIG. 9.

Relationship between stimulus level and phase locking. a Distribution of stimulus levels (re binaural single pulse threshold) at which envelope shape characterization was performed. b Best phase (mean phase of period histogram for the shape that evoked the largest firing rate) vs. stimulus level. Red line: trend predicted if phase simply corresponds to the point in the envelope burst that equals the single pulse threshold, as illustrated in c. For a fixed threshold, as level increases, threshold is attained earlier in the burst (i.e., at a smaller phase).