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The purpose of this investigation was to compare the ability of young and older adults to integrate auditory and visual sentence materials under conditions of good and poor signal clarity. The principle of inverse effectiveness (PoIE), which characterizes many neuronal and behavioral phenomena related to multisensory integration, asserts that as unimodal performance declines, integration is enhanced. Thus, the PoIE predicts that both young and older adults will show enhanced integration of auditory and visual speech stimuli when these stimuli are degraded. More importantly, because older adults' unimodal speech recognition skills decline in both the auditory and visual domains, the PoIE predicts that older adults will show enhanced integration during audiovisual speech recognition relative to younger adults. This study provides a test of these predictions.

Aging, Audiovisual Integration, and the Principle of Inverse Effectiveness