Is There Phonemic Regression in Aphasic Speech?

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Abstract
The markedness complexity of 825 consonant substitutions, e.g., t/k, made by 9 apraxic patients was studied and yielded a significant difference between the complexity of target consonants and the complexity of intruder consonants. An analysis of the directional changes in markedness of the various features showed that the features continuant, strident, coronal, anterior and nasal all exhibited strong tendencies to change from marked to unmarked. Of the changes 61% were from marked to unmarked and which compared favorably with the 60% for such changes for children who misarticulated consonants. When the data for vocalic and voicing were removed from the present analysis this percentage increased to 75.5%. Processes used by aphasics and children to simplify consonant production apparently were similar, a finding consistent with Jakobson''s original regression hypothesis.

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