Event-related desynchronization/synchronization during an auditory-verbal working memory task in mild Parkinson's
Ulla Ellfolk1, Mira Karrasch, Matti Laine
1Department of Psychology, Abo Akademi University, FIN-20500 Turku, Finland. ulla.ellfolk@abo.fi
Summary
Parkinson's disease (PD) may alter brain activity during auditory-verbal working memory. Alpha frequency synchronization (ERS) during memory encoding was reduced in PD patients compared to controls, suggesting neurophysiological changes in working memory.
Area of Science:
- Neuroscience
- Cognitive Science
- Neurology
Background:
- Parkinson's disease (PD) is a neurodegenerative disorder affecting motor function.
- Working memory deficits are increasingly recognized in PD.
- Understanding the neural underpinnings of working memory in PD is crucial.
Purpose of the Study:
- To investigate event-related desynchronization (ERD) and synchronization (ERS) in the EEG of Parkinson's disease patients during an auditory-verbal working memory task.
- To compare oscillatory brain activity between PD patients and healthy controls.
Main Methods:
- Studied mild-stage PD patients (n=7) and healthy controls (n=10).
- Utilized wavelet transforms to analyze 1-25 Hz EEG frequencies during memory encoding and retrieval.
- Assessed event-related desynchronization and synchronization patterns.
Main Results:
- No performance differences were found between groups on the working memory task.
- Alpha (10-15 Hz) ERS during encoding was observed in controls but absent in PD patients.
- Pre-stimulus alpha ERS during encoding was also absent in the PD group.
Conclusions:
- Parkinson's disease appears to affect brain oscillatory responses in the alpha frequency band during the encoding phase of auditory-verbal working memory.
- Altered ERD/ERS patterns may indicate neurophysiological changes contributing to working memory impairments in PD.
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