This study examined the acquisition and long-term maintenance of a functional core vocabulary by a severely apractic-aphasic speaker following the application of Prompts for Restructuring Oral Muscular Phonetic Targets (PROMPT) treatment. The subject was a 24-year-old male who had suffered a single left-hemisphere thrombotic CVA approximately 2 years prior to the beginning of this investigation. Treatment and maintenance were monitored over a 41-week period. The results showed that the 30 target words and phrases were produced accurately during the treatment phases of the study and after treatment was discontinued.
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Freed et al. (1997) studied this question.