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EEG coherence and power changes during a continuous movement task.

M R Ford, J W Goethe, D K Dekker

    International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
    |July 1, 1986
    PubMed
    Summary
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    EEG coherence (COH) increased during hand movements, particularly in prefrontal, premotor, and motor areas. These changes were not due to artifacts, suggesting COH reflects cortical activity during motor tasks.

    Area of Science:

    • Neuroscience
    • Cognitive Neuroscience
    • Motor Control

    Background:

    • Electroencephalography (EEG) coherence (COH) quantifies synchronized neural activity between brain regions.
    • Understanding cortical involvement in motor tasks is crucial for neuroscience and clinical applications.
    • Previous studies have explored EEG changes during motor tasks, but artifact assessment and specific coherence patterns require further investigation.

    Purpose of the Study:

    • To measure EEG coherence during a well-defined motor task involving hand movements.
    • To investigate the specific frequency bands and cortical areas associated with changes in EEG coherence.
    • To differentiate genuine EEG coherence changes from artifacts introduced by eye or facial muscle movements.

    Main Methods:

    • EEG data were collected from 14 healthy women performing alternating hand clenching and finger extension.

    Related Experiment Videos

  • EEG coherence was analyzed in specific frequency bands (9-12 Hz) across various electrode pairs (interhemispheric and intrahemispheric).
  • Electrooculography (EOG) and electromyography (EMG) were used to identify and exclude artifactual signals.

    • Main Results:

    • EEG coherence significantly increased during hand movement conditions, especially in the 9-12 Hz range.
    • Increased coherence was most prominent in prefrontal, premotor, and motor cortical areas.
    • No significant changes in spectral power were observed, and increases in coherence were not attributable to EOG or EMG artifacts.

    Conclusions:

    • EEG coherence is a sensitive measure of cortical engagement during externally verified motor tasks.
    • The findings highlight the role of prefrontal, premotor, and motor cortices in hand movements.
    • Future research should explore lateralization and the application of EEG coherence in clinical populations.