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Event-related potentials in Parkinson's disease
A Aotsuka1, S J Weate, M E Drake
1Ohio State University Hospitals, Department of Neurology, Ohio State University College of Medicine, Columbus, USA.
Electromyography and Clinical Neurophysiology
|June 1, 1996
Summary
Cognitive evoked potentials, P300 and contingent negative variation (CNV), reveal early cognitive changes and motor function correlations in Parkinson's disease (PD) patients. These findings suggest potential for monitoring PD progression.
Area of Science:
- Neuroscience
- Neurology
- Cognitive Science
Background:
- Dementia is increasingly recognized in Parkinson's disease (PD).
- Cognitive evoked potentials, P300 and contingent negative variation (CNV), are potential biomarkers for cognitive function and dopaminergic activity in PD.
Purpose of the Study:
- To investigate P300 and CNV in non-demented Parkinson's disease patients.
- To assess the relationship between these evoked potentials and cognitive/motor functions in PD.
Main Methods:
- Measured P300 and CNV in 21 non-demented PD patients and compared them to elderly controls.
- Utilized auditory oddball paradigm for P300 and a sensory-preoculomotor task for CNV.
- Recorded electroencephalography (EEG) signals from specific scalp locations with defined filter settings.
Main Results:
- PD patients showed significantly altered N200 and P300 amplitudes and latencies compared to controls.
- P300 latency correlated with cognitive test performance, suggesting cognitive impairment in non-demented PD.
- CNV amplitude was reduced in PD patients and correlated with motor disability, not cognitive measures.
Conclusions:
- P300 alterations may indicate early cognitive changes (bradyphrenia) in non-demented PD patients.
- CNV may serve as a dopaminergic marker reflecting motor function in early PD.
- Evoked potentials offer potential for monitoring cognitive and motor aspects of Parkinson's disease.