Abstract
Thirty adult aphasic subjects without apraxia of speech or dysarthria were tested for their ability to produce phonemes in single test words and in spontaneous contextual speech. Results indicated that 75% of the total phonemic errors were due to a whole-word phenomenon apparently associated with faulty processing of the word rather than faulty production of the phoneme. True phonemic errors comprised 25% of the total errors or about 2% of all responses. Phoneme substitutions were by far the most frequent error (61%). Of the 30 subjects, 28 made no phonemic errors in spontaneous contextual speech. Aphasic behavior is not characterized by significant breakdown of articulatory performance. Observed patterns of error do not clearly support a phonemic regression hypothesis.
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