Abstract
Two strains of guinea pigs were exposed to a 1-kHz tone at +50 dB re 1 dyn/cm2 for 30 minutes. One of these strains was genetically homogeneous, while the other strain was genetically heterogeneous. A 1-µV isopotential curve for the ac cochlear potential was obtained immediately before exposure to the damaging sound, as well as 10 minutes and 56 days after the sound exposure. The isopotential curves obtained from the homogeneous group were significantly less variable than the curves obtained from the heterogeneous group. This difference in variability was more pronounced 10 minutes after the damaging exposure than it was 56 days after the exposure.
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