Abstract
The correlation between classic masking patterns and psychoacoustical tuning curves is discussed quantitatively. A simplified method to measure such tuning curves in clinical use is described. They are shown to be insensitive to the frequency dependence of the hearing loss. Tuning curve data of six different groups including normal and hard-or-hearing observers are given: normal hearing, conductive hearing loss, degenerative hearing loss, noise-induced hearing loss, otosclerosis and Menière's disease. The resulting tuning curve data indicate that the frequency resolving power of the four groups mentioned last is greatley reduced but not completely absent, especially in the range of greater hearing loss. The correspondence between the frequency-resolving power measured by the tuning curve method and the result of speech discrimination tests is demonstrated. The measured data indicate that more than 50% of the patients with otosclerosis show reduced frequency selectivity although otosclerosis is commonly regarded as a conductive hearing loss.
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