Abstract
It was thought that temporary threshold shift of hearing due to exposure to noise might be more easily understood if the shifts were considered in terms of the rms pressure rather than in decibels. Therefore, the forms to be expected if the rate of shift of the pressure threshold were proportional to the difference between itself and the ultimate threshold were calculated and compared with a limited selection of published data. Good agreement with data for individuals during growth of TTS, and for one example of intermittent exposure to noise, was found and moderately good agreement with recovery. Agreement with averaged data, particularly for intermittent exposures, was poor, possibly because averaging the widely disparate figures obtained for individuals masks the true effects. It is also shown that the maximum ultimate TTS due to exposure to noise may be simply related to the mean square pressure of that noise. Further consideration of the mass of published work is needed, but this study suggests that at least some facets of TTS can be simply described in terms of exponential pressure shifts.
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