Differential Effect of Conductive Hearing Loss on the Threshold-Duration Function

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Abstract
Where the threshold-duration function has been shown to be systematically affected by sensorineural hearing losses of cochlear origin, preliminary studies have strongly suggested the contrasting finding that conductive hearing losses have no effect. Two series of experiments were performed to examine more fully these separate effects. Threshold-duration functions were obtained from listeners presenting 1) pure conductive and 2) mixed hearing impairments. The results indicate that the threshold-duration function is indeed differentially affected. More exactly, only the sensorineural component of a hearing loss affects the results which are obtained; while the conductive component has no effect. Such findings are interpreted to indicate that the threshold-duration function provides additional information not presently available for the differential diagnosis of auditory disorders.

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