Volume 37, Number 5,
September/October 2000

Abstract - The effect of filtering and inter-digit interval on the recognition of dichotic digits

Anne Strouse, PhD and Richard H. Wilson, PhD

Veteran Affairs Medical Center, Mountain Home, Tennessee; Departments of Surgery and Communicative Disorders, East Tennessee State University, Johnson City, Tennessee


Abstract — The new compact disc from the Department of Veterans Affairs, Tonal and Speech Materials for Auditory Perceptual Assessment, Disc 2.0 (1998), contains two lists of randomly interleaved 1-, 2-, and 3-pair dichotic digits. Two experiments are reported, in which the effects of low-pass filtering and inter-digit interval on dichotic digit recognition were investigated in adult listeners with normal hearing and with mild-to-moderate cochlear hearing loss. Results demonstrated that in the filtered condition, as the low-pass cutoff was increased, there was an increase in recognition performance for 1-, 2-, and 3-pair dichotic digits. When compared to normative data for the materials, findings indicate that the interleaved 1-, 2-, and 3-pair dichotic digit materials were essentially resistant to the effects of hearing loss. There was no significant change in recognition performance as a function of inter-digit interval. The studied 625-ms range of inter-digit intervals produced consistent recognition performance with both groups of listeners.

Key words: aging, auditory perception, compact disc (CD), dichotic listening tests, filtered speech, speech perception, uncertainty

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