The masked threshold of pure tones as a function of duration.

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Abstract
The noise-masked threshold of pure tones was measured as a function of tonal duration. Four frequencies and durations from 12.5 to 2000 msecs. were used. The following results and conclusions were presented: The ear integrates acoustic energy linearly up to 200 msecs., for when the duration is decreased by a factor of 10, sensitivity is decreased by 10 db. For durations longer than 200 msecs., the change in sensitivity is slight and acoustic integration may be considered complete at approx. one sec. The data substantiate the hypothesis that acoustic integration is linear if zero intensity is regarded as that intensity which is effectively zero for the ear. Mathematical relations between this hypothesis and Crozier''s statistic theory are such that if the data fit one hypothesis, they must of necessity fit the other.
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