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J Neurophysiol 82: 2833-2838, 1999;
0022-3077/99 $5.00
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The Journal of Neurophysiology Vol. 82 No. 5 November 1999, pp. 2833-2838
Copyright ©1999 by the American Physiological Society

RAPID COMMUNICATION

Donders' Law in Torticollis

W. P. Medendorp,1 J.A.M. van Gisbergen,1 M.W.I.M. Horstink,2 and C.C.A.M. Gielen1

 1Department of Medical Physics and Biophysics, University of Nijmegen, NL 6525 EZ Nijmegen; and  2Department of Neurology, University Hospital, NL 6500 HB Nijmegen, The Netherlands

Medendorp, W. P., J.A.M. van Gisbergen, M.W.I.M. Horstink, and C.C.A.M. Gielen. Donders' Law in Torticollis. J. Neurophysiol. 82: 2833-2838, 1999. We investigated head movements of patients with spasmodic torticollis toward targets in various directions. These patients, whose severe dystonia was reflected in an abnormal resting head position, appeared to retain a Donders'-type strategy for the control of the rotational degrees of freedom of the head. As in normals, rotation vectors, representing head orientation, were confined to a curved surface, which specifies how head torsion depends on gaze direction. The orientation of the surface in body coordinates, which was very stereotyped in normals, was different for patients. The same Donders surface was found for head movements and for stationary head postures, indicating that the same neural mechanism governs its implementation in both tasks. To interpret our results, we propose a conceptual scheme incorporating the basal ganglia, which are thought to be involved in the etiology of torticollis, and an implementation stage for Donders' law.




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