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A Mouth Asymmetry Study

Roger Graves, PhD; Theodor Landis, MD

Arch Neurol. 1985;42(3):249-251.

Abstract
• Clinical observation of aphasic patients often shows a dissociation between impaired propositional speech and preserved automatic speech. The question of differing hemispheric control between these speech tasks was examined by measuring asymmetry in facial muscle activity. In spite of right-sided facial palsy, greater opening of the right side of the mouth was seen for spontaneous speech, repetition, and word list generation, suggesting that the damaged left hemisphere still controlled motor output in these propositional tasks. However, greater opening of the left side of the mouth for serial speech and singing indicated at least a relatively greater role of the right hemisphere in these "automatic" tasks.

Author Affiliations
From the Departments of Psychology, University of Victoria, Victoria, British Columbia, (Dr Graves); and the Department of Neurology, University of Zurich Hospital (Dr Landis).

Footnotes
Accepted for publication April 26, 1984.

Read in part before the meeting of the International Neuropsychological Society, Lisbon, June 16, 1983.

Reprint requests to Department of Psychology, University of Victoria, Victoria, British Columbia, Canada V8W 2Y2 (Dr Graves).

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