Distorted visual feedback effects on drawing in Parkinson's disease

We investigated the effects of distorted visual feedback on the drawing performance of a group with Parkinson's disease (PD) and a control group. Twenty older healthy adults and 20 PD patients copied figures onto a digitizer tablet with a pen under normal and distorted visual feedback condition...

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Bibliographic Details
Published in:Acta psychologica 1997-04, Vol.95 (3), p.255-266
Main Authors: Fucetola, Robert, Smith, Marcia C.
Format: Article
Language:English
Subjects:
Aged
Biological and medical sciences
Distortion
Factors
Feedback
Female
Geriatrics
Humans
Male
Medical sciences
Middle Aged
Motor control
Motor learning
Motor performance
Neurological disease
Neuropsychology
Parkinson Disease - diagnosis
Parkinson Disease - psychology
Parkinson's disease
Patients
Pattern Recognition, Visual
Perceptual Distortion
Practice (Psychology)
Psychology. Psychoanalysis. Psychiatry
Psychomotor Performance
Psychopathology. Psychiatry
Size Perception
Visual feedback
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Summary:We investigated the effects of distorted visual feedback on the drawing performance of a group with Parkinson's disease (PD) and a control group. Twenty older healthy adults and 20 PD patients copied figures onto a digitizer tablet with a pen under normal and distorted visual feedback conditions. PD patients were less able than controls to adjust the size of their drawing to compensate for distortions in visual feedback. The effect was particularly pronounced when patients were required to draw smaller than normal. Nevertheless, with practice, PD patients showed a similar degree of improvement in size as controls, although they did not match the control group's level of performance. Overall, these findings support the notion that PD may have specific difficulty adjusting to a change in gain (or discrepancy) between visual and kinesthetic feedback when they must alter the size of their drawing. These findings point to the putative role of the basal ganglia in adjusting for the intermodal discrepancy between sensory feedback, and re-scaling the size of movements.
ISSN:0001-6918
1873-6297
DOI:10.1016/S0001-6918(96)00043-1