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Effect of l-dopa on speech in Parkinsonism
  1. R. Leanderson,
  2. B. A. Meyerson,
  3. A. Persson
  1. Department of Otolaryngology, Karolinska sjukhuset, Stockholm, Sweden
  2. Department of Neurosurgery, Karolinska sjukhuset, Stockholm, Sweden
  3. Department of Clinical Neurophysiology, Karolinska sjukhuset, Stockholm, Sweden

    An EMG study of labial articulatory function


    The articulatory function of the labial musculature has been investigated electromyographically before and after treatment with l-dopa in patients with Parkinsonism who had dysarthria. Before medication the EMG traces generally showed a constant, abnormally increased, tonic activity, together with disturbed reciprocal innervation, which impaired the articulatory activity. After medication the tonic hyperactivity was reduced and the reciprocal innervation re-established. This normalization of the EMG articulatory pattern was paralleled by an improvement of the dysarthria.

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    An EMG study of labial articulatory function


    • 1 This paper is one in a collection dedicated to Professor Herbert Olivecrona, by friends and pupils, on his 80th birthday, 11 July, 1971. The work was supported by the Swedish Medical Research Council (Project no. B 71-61P-3213-01) and the Karolinska Institutet Research Funds.