Abstract
Auditory temporal summation functions were measured for five cats before and after they were exposed to a 2‐kHz tone at 110 dBA for 48 h. Ten digitally generated stimuli with overall durations ranging from 8.32 to 275 ms were used. Stimulus frequency was 6.25 kHz. Six stimuli consisted of single tone bursts and the remaining four contained multiple tone bursts. Twelve acceptable thresholds for each stimulus were obtained from each animal before and after exposure. Threshold measurements began again no sooner than 27 days postexposure. Pre‐ and postexposure audiograms were also obtained and mean permanent threshold shift at 6.25 kHz was 32.6 dB. Pre‐ and postexposure temporal summation functions were characterized by the slope of the regression lines for threshold versus log duration. The mean slope in dB per decade of duration was − 6.6 preexposure and − 3.8 postexposure. The slope for normal‐hearing cat is very similar to the slope of − 6.1 that was obtained in a companion study that used normal‐hearing human subjects.
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