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Trans-saccadic integration of orientation information.

Michele Fornaciai1, Paola Binda2,3, Guido Marco Cicchini3

  • 1Department Psychological and Brain Sciences, University of Massachusetts at Amherst, Amherst, MA, USA.

Journal of Vision
|April 6, 2018
PubMed
Summary

Visual information is integrated across eye movements (saccades), not processed anew. Even with eye shifts, visual perception of grating orientation remains stable, indicating integration within external spatial coordinates.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Understanding visual processing across eye movements is crucial for explaining continuous perception.
  • The integration hypothesis predicts interference between visual information acquired before and after saccades.
  • Previous research has not definitively determined if visual processing resets or integrates across saccades.

Purpose of the Study:

  • To test the integration hypothesis by examining visual perception of grating orientation across saccades.
  • To determine if visual information acquired after a saccade interferes with perception of pre-saccadic information.
  • To investigate the spatial frame of reference for visual information integration.

Main Methods:

  • Human participants viewed target gratings at eccentric locations.
  • A delayed interference paradigm was used, with flanker gratings presented after the target.
  • Saccades were sometimes made during the delay interval, and flanker locations were manipulated (retinotopic vs. external coordinates).

Main Results:

  • The orientation of a target grating was biased by subsequently presented flanker gratings.
  • This interference effect persisted regardless of whether a saccade was made during the delay.
  • The trans-saccadic effect diminished when flankers were spatially displaced, even if retinotopically aligned.

Conclusions:

  • Visual information, specifically grating orientation, is integrated across saccades.
  • This integration occurs within a spatial frame of reference defined by external coordinates, not retinotopic ones.
  • Visual perception remains stable across eye movements due to this external coordinate-based integration.