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.
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