Abstract
Some recent studies have indicated that noise exposures which do not, alone result in measurable TTS (temporary threshold shift) may nevertheless enhance the effect of a succeeding TTS-producing stimulus. The present experiments were designed to measure this “latent” effect in the case of the TTS at 3 and 4 kc produced by 1200–2400-cps octave-band noise. The TTS resulting from a 12-min (or longer) exposure to 100 db SPL was the same whether the exposure was preceded by 1 hr of (a) silence, (b) 60 db SPL, or (c) 70 db SPL. Apparently “latent” effects can be observed only when the principal (second) exposure is of short duration and high intensity. It is shown that this conclusion is in accord with present knowledge concerning the laws governing the growth and decay of TTS. (This study was supported by research grant B-1122 from the National Institutes of Neurological Diseases and Blindness, Public Health Service.)
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