Abstract
The hearing sensation fluctuation strength of narrow-band noise shows a bandpass characteristic as a function of bandwidth δf with a maximum near δf = 6.32 Hz, corresponding to average envelope variations of 4 Hz. Fluctuation strength increases with an increase in sound pressure level from 40 to 90 dB by a factor of 10, and, at low (100 Hz) and high (7 kHz) center frequencies is about 30 % smaller than at mid frequencies around 1 kHz. A very similar dependence of fluctuation strength on stimulus parameters is found for AM sounds that produce periodic variations in their temporal envelope, in contrast to the statistical envelope variations of narrow-band noise. Sounds which elicit the hearing sensation fluctuation strength with their slow (< 20 Hz) variations of the temporal envelope are primarily represented at higher centers of the auditory pathway. These sounds are of great importance for acoustic communication.
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