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Illusory tilt does not induce optostatic torsion.

Mihret Girum1,2, Ariel Winnick1,3, Jorge Otero-Millan1,3

  • 1Herbert Wertheim School of Optometry and Vision Science, University of California, Berkeley, USA.

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|August 6, 2025
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Summary
This summary is machine-generated.

Illusory visual tilt does not trigger optostatic torsion (OST), an eye movement response to perceived image tilt. Real tilted images and control stimuli elicited OST, suggesting a dissociation between visual tilt perception and the motor response driving OST.

Keywords:
eye movementstilt perceptiontorsionvisual illusions

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Ophthalmology

Background:

  • Optostatic torsion (OST) is an eye movement response to viewing tilted images, involving a ~1° rotation around the line of sight.
  • This response typically aligns with the direction of perceived image tilt, indicating a connection between visual input and eye motor control.

Purpose of the Study:

  • To investigate whether illusory perceptions of visual tilt are sufficient to elicit optostatic torsion (OST).
  • To determine if the motor response of OST dissociates from the subjective perception of visual tilt.

Main Methods:

  • An illusory stimulus based on the Café Wall illusion was created to simulate a tilted room.
  • Perceived tilt magnitude was measured using a two-alternative forced choice (2AFC) task.
  • Binocular eye movements were recorded in ten subjects viewing illusory, real tilted landscapes, and control stimuli.

Main Results:

  • The illusory stimulus induced a perceived tilt of approximately ±3.7°, but did not produce a significant OST (p=0.15).
  • Real tilted landscapes (±4° and ±30° tilt) and a control stimulus elicited significant OST (p<0.05).
  • A significant OST was observed for left vs. right tilt configurations in landscape and control conditions.

Conclusions:

  • Illusory visual tilt, unlike real tilt, does not appear to be sufficient to generate optostatic torsion (OST).
  • This suggests a potential dissociation between the brain's processing of perceived visual tilt and the motor pathways controlling the OST response.
  • Further research is needed to understand the neural mechanisms underlying this dissociation.