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Clin Neurophysiol. 2005 May;116(5):1213-21.

Asymmetric spatiotemporal patterns of event-related desynchronization preceding voluntary sequential finger movements: a high-resolution EEG study.

Author information

  • 1Human Motor Control Section, Medical Neurological Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892-1428, USA.

Abstract

OBJECTIVE:

To study spatiotemporal patterns of event-related desynchronization (ERD) preceding voluntary sequential finger movements performed with dominant right hand and nondominant left hand.

METHODS:

Nine subjects performed self-paced movements consisting of three key strokes with either hand. Subjects randomized the laterality and timing of movements. Electroencephalogram (EEG) was recorded from 122 channels. Reference-free EEG power measurements in the beta band were calculated off-line.

RESULTS:

During motor preparation (-2 to -0.5s with respect to movement onset), contralateral preponderance of event-related desynchronization (ERD) (lateralized power) was only observed during right hand finger movements, whereas ERD during left hand finger movements was bilateral.

CONCLUSIONS:

For right-handers, activation on the left hemisphere during left hand movements is greater than that on the right hemisphere during right hand movements.

SIGNIFICANCE:

We provide further evidence for motor dominance of the left hemisphere in early period of motor preparation for complex sequential finger movements.

PMID:
15826864
[PubMed - indexed for MEDLINE]
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