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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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Eye position effects in oculomotor plasticity and visual localization.

Eckart Zimmermann1, Markus Lappe

  • 1Department of Psychology, Università degli Studi di Firenze, 50135 Florence, Italy. eckartzi@gmail.com

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|May 20, 2011
PubMed
Summary
This summary is machine-generated.

Visual localization relies on an extraretinal reference frame, not just retinal input. Eye position influences spatial perception, particularly for scanning saccades, suggesting nonretinotopic coding for accurate visual guidance.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cognitive Science

Background:

  • Accurate visual localization requires a stable spatial reference frame, independent of eye movements.
  • Retinal image shifts during gaze changes necessitate extraretinal signals for consistent spatial coding.

Purpose of the Study:

  • To investigate whether visual object localization is coded in an extraretinal reference frame.
  • To examine the influence of eye position on saccadic adaptation and subsequent visual localization.

Main Methods:

  • Utilized outward saccadic adaptation induced by systematic target displacement in human subjects.
  • Assessed adaptation magnitude and visual localization changes for both reactive and scanning saccades.
  • Analyzed the modulation of adaptation and mislocalization as a function of eye position.

Main Results:

  • Scanning saccade adaptation showed significant eye-position-dependent modulation, with reduced adaptation at distant positions.
  • Changes in visual localization closely mirrored the eye position modulation observed in scanning saccade adaptation.
  • Reactive saccade adaptation exhibited smaller, less position-dependent effects on visual localization.

Conclusions:

  • Evidence suggests visual localization is coded in a nonretinotopic, extraretinal reference frame, particularly for scanning saccades.
  • Oculomotor plasticity, especially scanning saccade adaptation, strongly influences spatial perception and visual localization.
  • Differential modulation of saccade adaptation implies multiple neural sites for oculomotor plasticity.