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Right lateralized motor cortex activation during volitional blinking.

T van Eimeren1, H Boecker, E C Konkiewitz

  • 1Department of Neurology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany.

Annals of Neurology
|June 21, 2001
PubMed
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Volitional blinking activates motor cortex and supplementary motor area (SMA). Self-initiated blinking, compared to externally cued, engages the left dorsolateral prefrontal cortex (DLPFC) and rostral SMA, suggesting right-hemisphere dominance for voluntary actions.

Area of Science:

  • Neuroscience
  • Motor Control
  • Brain Imaging

Background:

  • Blinking is a fundamental motor action.
  • Previous studies in stroke patients suggested right-hemispheric lateralization for volitional blinking.
  • The neural underpinnings of self-initiated versus externally cued movements require further elucidation.

Purpose of the Study:

  • To investigate the neural correlates of self-initiated and externally cued blinking using positron emission tomography (PET).
  • To test the hypothesis of right hemispheric lateralization for volitional blinking.
  • To explore the role of specific brain regions, such as the dorsolateral prefrontal cortex (DLPFC) and supplementary motor area (SMA), in self-initiated movements.

Main Methods:

  • H2 15O positron emission tomography (PET) was employed.

Related Experiment Videos

  • Six healthy volunteers participated in the study.
  • Brain activation patterns were analyzed during self-initiated and externally cued blinking tasks.

    • Main Results:

    • Both self-initiated and externally cued blinking activated the right primary motor cortex and SMA.
    • The left dorsolateral prefrontal cortex (DLPFC) and rostral SMA showed significantly greater activation during self-initiated blinking compared to externally cued blinking.
    • Findings support right-hemispheric lateralization for volitional blinking.

    Conclusions:

    • The study confirms the right-hemispheric lateralization of volitional blinking.
    • The left DLPFC and rostral SMA are implicated in the self-initiation of movements.
    • These findings extend previous observations on motor control and self-initiated actions.