Figure 5.

Response and recovery in a shortpass DTN. (A) Dot raster display of spiking in a shortpass DTN in response to variable duration BEF tones. (B) Mean ± SE spikes per stimulus as a function of stimulus duration. This cell had a BD of 2 ms. (C) Dot raster display illustrating spiking in response to pairs of BD tones presented at variable IPIs. The shaded gray regions illustrate the customized P1 and P2 analysis windows bounded by ±2 SDs from the baseline FSL and baseline LSL of the cell (see Figure 1). (D) Spike count ratio of response as a function of IPI. Spiking in response to tone P2 recovers to within 50% of baseline (dotted line) in response to P1 at 46 ms using both the short-to-long (*) and long-to-short (†) method. (E) Mean FSL and (F) mean LSL as a function of IPI for responses evoked by tone P1 (red closed symbols) and tone P2 (blue open symbols). (E) The cell's FSL (re P2) returns to within 1 SD of baseline at 20 ms using both the short-to-long and long-to-short methods, whereas (F) the LSL (re P2) returns to within 1 SD of baseline at 14 ms using the short-to-long method. No recovery time value was obtained with the long-to-short method because there was not two consecutive IPIs where the function deviated by >1 SD from the baseline LSL. Latencies determined after windowing spikes with the cell-specific P1 and P2 analysis windows. Dotted lines represent ±1 SD relative to baseline latency (re P1). Missing values represent IPIs where no spikes fell into the analysis window. (A,B) MU036.02.06: BEF, 38 kHz; threshold, 48 dB SPL; amplitude +20 dB re threshold; 15 repetitions per stimulus. (C–F) MU036.02.12: BEF, 38 kHz; threshold, 48 dB SPL; amplitude +20 dB re threshold; 20 repetitions per IPI step.