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Initial control component in disparity vergence eye movements

J L Semmlow1, G K Hung, J L Horng

  • 1Department of Biomedical Engineering, Rutgers University, Piscataway, NJ 08855.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|January 1, 1993
PubMed
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The initial oculomotor response to visual disparity is preprogrammed and occurs without visual feedback, supporting a dual-mode vergence control theory. This open-loop movement is influenced by stimulus amplitude but not duration or target height.

Area of Science:

  • Oculomotor control
  • Neuroscience
  • Vision science

Background:

  • Experimental evidence suggests some oculomotor responses to disparity lack visual feedback.
  • Understanding the factors influencing these open-loop movements is crucial for comprehending vergence control.

Purpose of the Study:

  • To investigate stimulus features that elicit or influence the dynamic, open-loop component of oculomotor convergence.
  • To differentiate between open-loop and closed-loop control mechanisms in vergence.

Main Methods:

  • Four subjects underwent infrared oculography to record convergence responses.
  • Stimuli included varying amplitudes (1-8 degrees) and disappearance times (50-200 ms) of a vertical line target.
  • Randomized stimuli and occasional divergent targets minimized prediction and voluntary vergence.

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Main Results:

  • The initial dynamic response characteristics remained consistent even when the target disappeared before movement completion.
  • Initial response magnitude correlated with stimulus amplitude but was independent of stimulus duration or target height.
  • The open-loop response persisted for approximately 200 ms before transitioning to visually-guided, closed-loop control.

Conclusions:

  • The findings support a dual-mode theory of vergence control.
  • An initial open-loop, preprogrammed component is followed by a closed-loop, visually-guided component.
  • This sequence effectively reduces visual disparity through a combination of automatic and feedback mechanisms.