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Related Experiment Videos

Blink effect on slow vergence.

Holger Rambold1, Gunnar Neumann, Andreas Sprenger

  • 1Department of Neurology, University of Luebeck, Ratzeburger Allee 160, D-23538 Luebeck, Germany. rambold_h@neuro.mu-luebeck.de

Neuroreport
|November 20, 2002
PubMed
Summary

Blinks influence slow vergence eye movements, causing a direction-dependent velocity peak during the blink. This suggests blinks may alter brain stem premotor circuits controlling eye movements.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Physiology

Background:

  • Blinks are known to affect fast eye movement kinematics.
  • The impact of blinks on slow vergence eye movements under natural conditions is not well understood.

Purpose of the Study:

  • To investigate whether blinks affect slow disconjugate (slow vergence) eye movements during natural viewing.
  • To determine the characteristics of blink-induced changes in slow vergence.

Main Methods:

  • Elicited airpuff-evoked trigeminal blinks during steady slow vergence.
  • Recorded lid and binocular eye movements using the scleral search coil method.

Main Results:

  • Slow vergence eye movements exhibited a peak vergence velocity during the latter part of the blink.

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  • This blink-induced effect on vergence velocity was dependent on the stimulus direction.

    • Conclusions:

    • Blinks can modify slow vergence eye movements.
    • The direction-specific effect suggests alterations in brain stem premotor circuits due to blinks.