Relation between Recovery from Temporary Threshold Shift and Duration of Exposure

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Abstract
Approximately 20 db of TTS at 3 and 4 kc, measured 2 min after cessation of the TTS-producing stimulation, was produced in 14 normal listeners by three different exposures to 1200- to 2400-cps noise: to 106 db SPL for 12 min, to 98 db for 27 min, and to 90 db for 117 min. Despite the fact that the TTS produced at other frequencies was different for the three exposures, the courses of recovery at 3 and 4 kc were indistinguishable. From these results and those of others, it is concluded that the course of recovery from TTS is uniquely determined by the value of TTS at 2 min recovery: i.e., by the TTS remaining after the first fast recovery process, the so-called R-1 recovery process, has run its course.

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