Previous results show that the acoustic startle reflex in the rat is inhibited if a relatively weak stimulus precedes the startle-eliciting tone burst. The present 5 experiments explored the effect of brief silent periods (gaps) in white noise on the startle reflex in order to describe the limits of temporal resolution in the auditory system of 12 Long-Evans hooded rats. Brief silent periods did depress reflex behavior, and 2 responsible processes were identified. One was most evident at a 190-msec lead time between gap and startle tone. It yielded a linear decrement in reflex expression over a dynamic range of 0–7 msec and an estimate for the threshold of temporal acuity of 3.5 msec. The 2nd was evident primarily at a 40-msec interstimulus interval and had a linear effect over a dynamic range of at least 40 msec. Brief gaps had a greater inhibitory effect at the 190-msec interval between gap and startle stimulus; prolonged gaps had their greater effect at the 40-msec interval. The 1st process was identified as reflex inhibition, which is sensitive to the sensory properties of the lead stimulus. The 2nd process was identified as sensory adaptation, produced by noise exposure but unmasked by silence. (47 ref)
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Temporal acuity in auditory function in the rat: Reflex inhibition by brief gaps in noise
Ison, James R.
Follow Journal of Comparative and Physiological Psychology
, Volume 96 (6): 945
PsycARTICLES® – Dec 1, 1982
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