Recovery Pattern From Auditory Fatigue

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Abstract
Pattern of recovery of the auditory threshold after intense stimulation is characterized by a secondary maximum or "bounce" at approximately 2 minutes after cessation of the fatiguing stimulus. With a 2-minute fatiguing tone at a frequency of 3000 cps and an interrupted threshold tracing signal of 4000 cps as the SPL of the fatiguing tone was increased from 80 to 95 db, the mean recovery curve showed a gradual increase in the magnitude of the "bounce." Above the 95 db, however, a sudden acceleration in initial threshold shift was accompanied by a gradual decrease in the magnitude of the bounce. At an SPL of 110 db the bounce had virtually disappeared. Disappearance of the bounce from the recovery curve may mark the transition from fatigue to reversible acoustic trauma.

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