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Adaptive changes in saccade amplitude: oculocentric or orbitocentric mapping?

J E Albano1

  • 1Center for Visual Science, University of Rochester, NY 14627, USA. jea@cvs.rochester.edu

Vision Research
|July 1, 1996
PubMed
Summary

Rapid saccadic adaptation adjusts eye movements to visual targets. This study shows adaptation is primarily oculocentric (retina-referenced), not orbitocentric (head-referenced).

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Systems Biology

Background:

  • The saccadic system rapidly adapts refixation movements to correct postsaccadic errors.
  • The underlying mechanisms (oculocentric vs. orbitocentric) of this rapid saccadic adaptation remain unclear.

Purpose of the Study:

  • To investigate whether rapid saccadic adaptation is organized within oculocentric (retinal or motor error) or orbitocentric (eye or gaze position) reference frames.
  • To elucidate the spatial organization of rapid saccadic adaptation.

Main Methods:

  • Created a sensory-motor mismatch between visual targets and saccade requirements.
  • Measured adaptive changes in saccades as a function of saccade direction, eye position, and saccade amplitude.
  • Compared adaptation for increasing and decreasing saccade amplitudes.

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Main Results:

  • Adaptive changes were specific to saccade amplitude and direction.
  • Adaptation generalized across a wide range of orbital positions.
  • Increasing and decreasing amplitude adaptation yielded similar quantitative results.

Conclusions:

  • Rapid saccadic adaptation is organized primarily in a retina-referenced (oculocentric) map.
  • Adaptation shows limited organization in a head-referenced (orbitocentric) map.
  • The findings support mechanisms involving spatial mapping of retinal or motor error.