Figure 11.

From left to right, Averaged responses of a long-pass neuron to tone burst stimuli of 20, 50, and 100 ms (A) and presentation of one to four stimulus pulses, at a rate of 70 pulses/s (B), carrier frequency of 300 Hz. A, Responses to 20 ms tone bursts at 65 dB SPL (bottom dark trace) and 71 dB SPL (top dark trace) are shown; for all other cases shown with dark traces, stimulus amplitude was 65 dB SPL. Gray traces in A are the averaged responses to 20 ms tone bursts (300 Hz) at 59 dB SPL and +0.07 nA current clamp (left) and to 50 ms tone bursts (600 Hz) at 60 dB SPL (middle). Gray traces in B are recordings made with +0.1 or −0.03 nA current clamp to reveal the time courses of inhibition or excitation, respectively. The BEF was 300 Hz. The resting potential was −68 mV. C, Averaged responses of an additional long-pass duration-selective neuron to varying tone burst durations. Gray traces are responses to individual 40 ms tone bursts; EPSPs are denoted with filled circles. All traces were made at the BEF (1200 Hz), and the stimulus amplitude was 75 dB SPL. The resting potential was −64 mV. Ratios are number of spikes per the number of stimulus presentations.