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July 1962

Temporary Threshold Shift in Normal and Abnormal Ears

Arch Otolaryngol. 1962;76(1):52-54. doi:10.1001/archotol.1962.00740050056011

Recently, there has been intensified interest in the problem of temporary threshold shift (TTS) with speculation on its relationship to permanent threshold shift (PTS) in hearing loss resulting from noise exposure.1,2 Approximately 10 years ago, at the U.S. Naval Base in Philadelphia, we conducted a number of experiments in auditory fatigue which were never reported. In the light of recent developments in the field, we felt these data would be of current interest.

Hearing tests were performed on 105 subjects ranging in age from 24-69 years, most being under 50. Subjects with conductive hearing loss were excluded leaving only those with either normal hearing, or sensorineural loss due to noise exposure or presbycusis, or both. Some of the subjects were employed in areas where the over-all noise level was about 90 db. Prior to testing these subjects, sufficient time was allowed to exclude TTS. Most of the subjects had

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