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Related Experiment Videos

Asymmetry of blinking.

Iris S Kassem1, Craig Evinger

  • 1Department of Neurobiology and Behavior, SUNY Stony Brook, Stony Brook, New York 117940-5230, USA.

Investigative Ophthalmology & Visual Science
|December 31, 2005
PubMed
Summary

Eyelid blinking shows consistent asymmetry in timing and movement between eyelids in normal individuals. This asymmetry is stable, modifiable by physical changes, and originates from facial motor neuron differences.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Motor Control

Background:

  • Blinking is a fundamental protective reflex.
  • Understanding normal blinking mechanisms is crucial for diagnosing and treating facial nerve disorders.
  • Eyelid movement asymmetry in blinking is not well understood.

Purpose of the Study:

  • To investigate the presence, stability, and modifiability of eyelid movement asymmetry during blinking in healthy individuals.
  • To determine the underlying neural mechanisms of this asymmetry.

Main Methods:

  • Assessed differences in blink start time and amplitude between eyelids during voluntary and reflex blinks.
  • Measured blink variables before and after unilateral upper eyelid restraint for up to 18 months.

Main Results:

  • Consistent asymmetry in blink timing and amplitude was observed between the two eyelids.
  • Reflex blinks showed similar asymmetry patterns to voluntary blinks.
  • Eyelid asymmetry was stable, independent of other biological asymmetries, and could be modified by prolonged eyelid immobility.

Conclusions:

  • Eyelid asymmetry in blinking stems from differences in motoneuron excitability within the facial motor nuclei, not cortical input.
  • Adaptive changes in motoneuron excitability may explain blinking alterations in conditions like facial palsy and hemifacial spasm.

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