Abstract
Previous research in psychophysics has shown that the time course of recovery from forward masking is prolonged in listeners with sensorineural hearing loss (Nelson and Turner, 1980). In order to evaluate the physiological basis for the change in the time course of forward masking, evoked response recordings were obtained from the inferior colliculus of the chinchilla both before and after noise induced hearing loss. Evoked response “forward‐masking” functions were obtained by measuring the masker level required to produce a 50% reduction in the response to a probe tone (re: probe response alone) which followed the masker at various time intervals (2 to 100 ms). The time course of “forward masking” was estimated by fitting a time constant to the data. Animals were exposed to a pure tone that produced either 30–50 dB of asymptotic threshold shift or 25–30 dB of permanent threshold shift. The time constants fit to the “forward‐masking” function were found to be prolonged in the region of hearing loss. In general there was a strong correlation between the time constant of recovery from “forward masking” and hearing loss. The implications of these results will be discussed. [Work supported by NIH 5‐R01‐NS16761‐06 and NIOSH 1‐R01‐OH00364.]
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