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Dual task performance and processing resources in normal subjects and patients with Parkinson's disease
1Medical Research Council Human Movement and Balance Unit, London, UK.
Brain : a Journal of Neurology
|February 1, 1991
Summary
Parkinson's disease (PD) patients exhibit performance deficits due to depleted central processing resources, especially when external cues are absent. Dual-task studies confirm that PD patients struggle with resource-demanding tasks compared to controls.
Area of Science:
- Neuroscience
- Cognitive Psychology
Background:
- Parkinson's disease (PD) is associated with behavioral and attentional deficits.
- External cues can influence performance in PD patients.
- Previous work suggests task demands and depleted resources contribute to PD impairments.
Purpose of the Study:
- To investigate the role of central processing resources in Parkinson's disease.
- To compare the resource demands of cued versus uncued tasks.
- To examine dual-task performance in PD patients and controls.
Main Methods:
- Two experiments using dual-task paradigms.
- Experiment 1: Assessed Stroop task (cued vs. uncued) in healthy subjects.
- Experiment 2: Compared PD patients and age-matched controls on dual-task Stroop performance.
Main Results:
- Uncued tasks demand more processing resources than cued tasks.
- Healthy subjects performing a secondary task with the Stroop task showed PD-like deficits.
- PD patients, unlike controls, showed increased reaction times and interference in dual-task conditions.
Conclusions:
- Results support the hypothesis of depleted central processing resources in Parkinson's disease.
- Alternative explanations, such as deficits in switching resources, are considered.