Abstract
Sensation refers to the process of sensing our environment through touch, taste, sight, sound, and smell. Changes in hearing thresholds with age are underlying presbycusis and the various forms are reflected in audiogram phenotypes for purely sensory, that is, high-frequency hearing loss. Purely metabolic forms show flat hearing losses and mixed sensory-metabolic forms also occur. A sizeable proportion of the elderly have normal audiograms. The rate of threshold change with age appears to be independent of acquired hearing loss due to occupational noise. Objective indicators of outer hair cell damage, the otoacoustic emissions, are reduced in amplitude regardless of the form of the audiogram, and appear to be more sensitive indicators of cochlear damage than the audiogram.
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