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Related Experiment Videos

Blink-perturbed saccades in monkey. I. Behavioral analysis.

H H Goossens1, A J Van Opstal

  • 1Department of Medical Physics and Biophysics, University of Nijmegen, NL-6525 EZ Nijmegen, The Netherlands.

Journal of Neurophysiology
|June 10, 2000
PubMed
Summary

Blinking significantly alters saccadic eye movements, causing trajectory deviations and changes in speed and duration. However, the saccadic system compensates for these disruptions, maintaining accurate eye movements.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Motor Control

Background:

  • Saccadic eye movements are crucial for visual exploration.
  • Blinking's influence on saccades via premotor interactions is not fully understood.
  • Investigating blink-evoked eye movements provides insight into oculomotor control.

Purpose of the Study:

  • To characterize blink-associated eye movements.
  • To quantify the impact of reflex blinks on saccade metrics and kinematics.
  • To determine how the saccadic system compensates for blink-induced perturbations.

Main Methods:

  • Eliciting trigeminal reflex blinks using air puffs during saccade tasks in monkeys.
  • Measuring eye and eyelid movements with magnetic-induction technique.

Related Experiment Videos

  • Analyzing saccade latencies, trajectories, velocities, and durations.

    • Main Results:

    • Reflex blinks reduced saccade latencies and caused significant trajectory deflections (up to 15 degrees).
    • Saccade peak velocities decreased, and durations increased, but endpoint accuracy was largely maintained.
    • Blink-associated eye movements involved rapid, non-linear initial rotations and corrective saccades.

    Conclusions:

    • Blinks interfere with the saccade premotor circuit, likely upstream of the neural eye-position integrator.
    • Neural mechanisms, not passive forces, underlie saccade compensation during blinks.
    • Observed kinematic changes suggest blink system inhibition of omnipause neurons.