Brain, Vol. 115, No. 5, 1481-1495, 1992
© 1992 Guarantors of Brain
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SEQUENTIAL ARM MOVEMENTS IN PATIENTS WITH PARKINSON'S DISEASE, HUNTINGTON'S DISEASE AND DYSTONIA
Department of Neurological Sciences, University of Rome ‘La Saptenza’ Rome, Italy
Correspondence to:
Correspondence to Dr A Berardelli, Department of Neurological Sciences, University of Rome ‘La Sapienza’, Viale dell ‘Universita’ n 30. Rome 00185, Italy.
We studied the performance of sequential arm movements in 14 patients with Parkinson's disease, nine patients with Huntington's disease and seven patients with arm dystonia. The results were compared with those from normal subjects Subjects had to perform each movement of the sequence as fast as possible, stopping as briefly as possible between two successive movements. In one set of experiments, patients with Parkinson's disease drew four different geometrical patterns in a counter-clockwise direction. The patterns consisted of two, three, four and five segments of identical length. In a second set, the subjects drew a pentagon in a counter-clockwise and a clockwise direction and each side of the pentagon singly in a counter-clockwise direction.
All three groups of patients were slow in executing movements and in switching from one movement to the next Only patients with Parkinson's disease took longer to perform the segments at the end of a sequence In other words, their movement times lengthened progressively as the sequence progressed. This phenomenon could still be recognized when the direction and position of the segments were changed (pentagon drawn in the counter-clockwise and the clockwise direction) and when the extra-time needed, mainly due to the sequential nature of the task, was considered by computing the differences between movement times obtained during drawing of the pentagon and those obtained when each segment was traced singly.
This study demonstrates that sequential movements are abnormal in Parkinson's disease, Huntington's disease and dystonia and that in the performance of long motor sequences, the deficit in sequencing movements is exacerbated only in patients with Parkinson's discase.
Received August 20, 1991. Revised January 24, 1992. Accepted April 15, 1992.
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