Twenty-six patients with the speech disorder of Parkinson's disease received daily speech therapy (prosodic exercises) at home for 2 to 3 weeks. There were significant improvements in speech as assessed by scores for prosodic abnormality and intelligibility' and these were maintained in part for up to 3 months. The degree of improvement was clinically and psychologically important, and relatives commented on the social benefits. The use of a visual reinforcement device produced limited benefit over and above that from prosodic exercises alone, except to patients with severe speech disorder.
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