Abstract
The effects of the presence or absence of background noise during exposure were investigated for masked and quiet temporary threshold shift. The threshold for a 1400-cps signal was measured prior to and following exposure to a 1000-cps signal at 110 dB SPL for a period of 4 min. These measures were taken in the presence of bandlimited (150–4000 cps) random noise at an over-all sound-pressure level of 60 dB and in quiet. No consistent effects upon either masked or quiet temporary threshold shift were noted as a result of exposure in the presence of the noise. Other results were in agreement with previous investigations.
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