Abstract
One of the mechanisms that may underlie the central component of age-related hearing impairment is that older age is associated with a decrease in the speed with which many processing operations can be executed and that this reduction in speed leads to impairments in cognitive functioning because of what are termed the limited time mechanism and the simultaneity mechanism. That is, cognitive performance is degraded when processing is slow because relevant operations cannot be successfully executed (limited time) and because the products of early processing may no longer be available when later processing is complete (simultaneity). It is possible that at least some of the older adults’ receptive speech difficulties emerge as a result of deficient and distorted auditory encoding at preattentive, subcortical stages of speech processing.
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