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Related Experiment Videos

Lid-eye coordination during vertical gaze changes in man and monkey.

W Becker1, A F Fuchs

  • 1Sektion Neurophysiologie, Universität Ulm, Germany.

Journal of Neurophysiology
|October 1, 1988
PubMed
Summary

The upper eyelid and eye movements are closely coordinated during vertical gaze changes in humans and monkeys. This coordination, including lid saccades, suggests shared neural control mechanisms for eye and lid movements.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomechanics

Background:

  • The precise coordination between upper eyelid and eye movements during vertical gaze shifts is not fully understood.
  • Investigating this relationship can provide insights into shared neural control mechanisms.

Purpose of the Study:

  • To investigate the coordination between upper lid and eye movements during vertical gaze changes in humans and monkeys.
  • To explore the neural signals underlying these coordinated movements.

Main Methods:

  • Electromagnetic search-coil technique to measure lid and eye movements in humans and monkeys.
  • Recording isometric tension and EMG activity from lids to investigate neural signals.

Main Results:

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  • Close correspondence observed between lid and eye movement metrics during fixation, smooth pursuit, and saccades in both species.
  • Lid movements, termed 'lid saccades,' closely mirrored the time course and velocity profiles of vertical eye saccades.
  • Similarities in gain, phase shift, peak velocity, amplitude, and duration relationships between lid and eye movements were noted.

    • Conclusions:

    • The upper lid and eye exhibit remarkable coordination during vertical gaze changes, suggesting shared neural control.
    • Lid saccades are a distinct motor behavior that faithfully replicates eye saccade dynamics.
    • Further research into the neural signals is warranted to fully elucidate this coordinated motor control.