Fig. 4.

Responses of long-duration-selective neurons in the DZ to noise bursts of varied duration and varied sound intensity. The duration of noise bursts is shown below the PSTHs. Athicker duration marker indicates a stimulus of higher intensity. A, Discharges of neuron114r-003 were summed over 50 trials. The left column shows the responses to stimuli of 60 dB SPL, and theright column shows the responses to those of 70 dB SPL. The neuron was activated at a mean latency of 146 msec, but only when the stimulus lasted longer than 100 msec. B, Discharges of neuron 114r-013 were summed over 30 trials. The neuron was activated with a mean latency of ∼120 msec and showed no difference in spike number or minimal latency when presented with noise bursts of 100 or 200 msec duration. C, Discharges of neuron 116r-105 were summed over 100 trials. Responses to noise bursts of 60, 80, 100, 120, and 400 msec duration are shown in the PSTHs. The neuron was active with a mean latency of ∼76–90 msec and showed increasing activity when the duration of the noise burst was prolonged up to 120 msec.