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Programming of a movement sequence in Parkinson's disease
P Weiss1, G E Stelmach, H Hefter
1Motor Control Laboratory, Arizona State University, Tempe, USA.
Brain : a Journal of Neurology
|January 1, 1997
Summary
Parkinson's disease patients exhibit intact motor programming but struggle with implementing and switching between movement steps. This difficulty, observed in multi-component movements, suggests underlying issues with force control and movement termination.
Area of Science:
- Neuroscience
- Motor Control
- Movement Disorders
Background:
- Parkinson's disease (PD) is characterized by impaired execution of multi-component movements.
- The underlying cause, whether motor programming deficits or other factors, remains under investigation.
Purpose of the Study:
- To investigate if motor programming is impaired in Parkinson's disease patients.
- To examine the kinematic effects of varying accuracy demands on two-segment movements in PD patients.
Main Methods:
- Studied the kinematics of two-segment movements in 15 Parkinson's disease patients and age-matched controls.
- Analyzed the 'context effect' where first-segment kinematics were influenced by second-segment accuracy requirements.
Main Results:
- Both Parkinson's disease patients and controls showed a 'context effect' on movement kinematics.
- Parkinson's disease patients displayed significant hesitations between movement segments, unlike controls.
- Correlation indices between segment movement times related to the context effect only in Parkinson's disease patients.
Conclusions:
- Motor programming appears intact in Parkinson's disease patients, as evidenced by similar movement patterns to controls.
- Hesitations between movement segments suggest difficulties in implementing or switching motor program steps in PD.
- Impaired force control and movement termination capacity may explain motor program implementation deficits in Parkinson's disease.