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Purpose

This study investigated whether adults with dyslexia show evidence of a consistent speech perception deficit by testing phoneme categorization and word perception in noise.

Method

Seventeen adults with dyslexia and 20 average readers underwent a test battery including standardized reading, language and phonological awareness tests, and tests of speech perception. Categorization of a pea/bee voicing contrast was evaluated using adaptive identification and discrimination tasks, presented in quiet and in noise, and a fixed-step discrimination task. Two further tests of word perception in noise were presented.

Results

There were no significant group differences for categorization in quiet or noise, across-and within-category discrimination as measured adaptively, or word perception, but average readers showed better across-and within-category discrimination in the fixed-step discrimination task …