Abstract
Phonetic analyses were made of the articulatory errors of ten Broca's aphasics with apraxia of speech. Presentation mode, phoneme position, and phoneme frequency-of-occurrence were related to phoneme difficulty. Consonant clusters were more difficult than consonant singletons; vowels were easiest. Substitution, addition, and compound errors predominated, while distortions and omissions were much less frequent. A subphonemic feature analysis of substitution and distortion errors showed a majority of errors to be close approximations to target phonemes.
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