A 1‐hr exposure to a high‐frequency noise (2400–4800 cps at 100‐db SPL) was (a) preceded or (b) followed by a 1‐hr exposure to a low‐frequency noise (600–1200 cps at 110‐db SPL). Although both noises produced considerable temporary threshold shifts at frequencies just above the corresponding noise frequency, neither had any effect on the growth or recovery of shifts produced by the other. It is concluded that the course of the fatigue process at one area of the basilar membrane is relatively independent of conditions existing at other areas.

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