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Visualizing the perisaccadic shift of spatiotopic coordinates

W A Hershberger1, J S Jordan, D R Lucas

  • 1Department of Psychology, Northern Illinois University, De Kalb 60115, USA. wah@niu.edu

Perception & Psychophysics
|March 21, 1998
PubMed
Summary

During eye movements (saccades), the brain shifts visual spatial coordinates. This study found that this spatial coordinate shift is nearly complete by the end of the saccade, influencing perceived visual direction.

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Area of Science:

  • Neuroscience
  • Vision Science
  • Perception

Background:

  • During a saccade (rapid eye movement), the brain must update spatial awareness to maintain a stable visual world.
  • The perisaccadic shift of spatiotopic coordinates is a key mechanism for this visual stability.

Purpose of the Study:

  • To investigate the extent to which spatiotopic coordinate shifts are completed by the end of a horizontal saccade.
  • To determine if this shift influences the perceived visual direction of stimuli presented during the saccade.

Main Methods:

  • Participants made an 8-degree horizontal saccade while a point light source flickered, creating a phantom visual array.
  • They judged the visual direction of the tail end of the phantom array relative to a standard reference array.

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Main Results:

  • The perceived alignment of the phantom array's tail end occurred when it was imaged 7.4 degrees to the right of the standard array's start.
  • This indicates a significant perisaccadic shift in spatial representation.

Conclusions:

  • The shift of spatiotopic coordinates is substantially, if not entirely, complete by the conclusion of a saccade.
  • This rapid recalibration of spatial representation is crucial for accurate visual perception during and after eye movements.