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Reduced task-set inertia in Parkinson's disease.
Petra M J Pollux1, Colin Robertson
1Psychology Department, University of Lincoln, Brayford Pool, Lincoln, UK. ppollux@lincoln.ac.uk
Journal of Clinical and Experimental Neuropsychology
|March 26, 2003
Summary
Parkinson's disease (PD) patients show impaired cognitive inhibition, evidenced by increased Stroop interference. Reduced ability to maintain task-sets, crucial for response selection, may underlie these findings in PD.
Area of Science:
- Neuroscience
- Cognitive Psychology
Background:
- Parkinson's disease (PD) is a neurodegenerative disorder affecting motor function.
- Cognitive deficits, including executive dysfunction, are increasingly recognized in PD.
Purpose of the Study:
- To investigate the relationship between cognitive inhibition and set-switching costs in Parkinson's disease.
- To explore executive function deficits in PD using a set-switching task.
Main Methods:
- A set-switching task with predictable switches was administered to 13 PD patients and 16 controls.
- Stimuli included incongruent color-words and numerals requiring different response types (word-reading, color-naming, value-naming, group-size naming).
- Measures included Stroop interference and switch costs.
Main Results:
- PD patients exhibited increased Stroop interference, indicating difficulties with cognitive inhibition.
- Practice effects on nondominant tasks were reduced in PD patients.
- PD patients showed reduced switch costs early in dominant task lists and increased costs late in nondominant task lists.
Conclusions:
- Impaired cognitive inhibition and reduced ability to maintain task-sets are implicated in Parkinson's disease.
- These deficits may stem from an impaired capacity to inhibit irrelevant stimulus-response mappings.
- Findings suggest executive function impairments contribute to the cognitive profile of PD.