Temporary Auditory Threshold Shift Produced by Exposure to Broad Band Noise

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Abstract
In this study of temporary auditory threshold shift (TTS) some 70 normal hearing subjects were exposed to broad-band noise at 100 db SPL. Growth and recovery of TTS were determined from thresholds measured at 30 minute intervals during a four-hour period, two-hour exposure plus two-hour recovery. The exposure-recovery test series was run on each of three different days for each subject to allow estimates of repeat reliability of shifts in groups and in individuals. At all frequencies tested, the growth and recovery of the shift are logarithmic functions of time of the form TTS = const × log exposure (or recovery) time + const. The magnitude of the shift is larger at the higher frequencies. From replication to replication there is no consistent change in the magnitude of the two-hour shift either for the group mean or for individuals. There is no systemic change in individual pre-exposure thresholds with replication. Control group data indicate that practice effects did not affect the results. (This research was supported in part by a grant from the National Institutes of Health.)

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