Abstract
White noise thresholds were investigated as a function of stimulus duration in a monkey performing an auditory reaction time task. Latency-intensity functions were obtained for six durations, ranging from S to over 200 msec. Threshold was defined for each duration from ogive functions relating percentage of correct responses to stimulus intensity. Increasing stimulus duration resulted in lower thresholds. The slope of the threshold-duration function was asymptotic to a minimum value as duration was increased. Suprathreshold hearing functions in the form of equal latency contours will be described. In addition, the effect of aspirin upon threshold was studied at three stimulus durations. The subject showed a temporary threshold hearing change similar to that observed using "brief-tone" audiometry in humans with a cochlear hearing loss. A general elevation of threshold was observed. The greatest change occurred with the longest duration stimulus. [Work supported by PHS Grants NS 08181, RR 00166, NS 50637, and GM 00260.]
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