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Intelligibility of Time-Altered Speech in Relation to Chronological Aging

Daniel S. Beasley
Memphis State University, Tennessee

Fred H. Bess
Vanderbilt University School of Medicine, Nashville, Tennessee

The Northwestern University Auditory Test Number 6 (NU-6) measure of speech discrimination was time compressed and presented to four age groups ranging from 54 to 84 years of age. Experimental stimuli were presented at sensation levels of 24, 32, and 40 dB to an equal number of right and left ears and male and female subjects. Results indicated that intelligibility decreased as a function of increasing time compression and age and decreasing sensation level. Changes in speech intelligibility associated with the aging process appear to be closely allied to changes in the temporal resolving power of the central auditory processing system.