Saccade-induced changes in ocular torsion reveal predictive orientation perception

Area of Science:

• Neuroscience
• Vision Science
• Perception

Background:

• Natural gaze shifts cause ocular torsion, rotating the retinal image.
• Perceptual stability despite retinal image rotation is poorly understood, especially regarding torsion.
• Existing predictive remapping models often neglect the torsional component of eye movements.

Purpose of the Study:

• To investigate how the brain compensates for ocular torsion during gaze shifts.
• To examine the role of predictive remapping in maintaining orientation perception during saccades.
• To understand how orientation perception integrates spatial and feature (torsional) components.

Main Methods:

• Utilized oblique eye movements to induce natural ocular torsion.
• Measured orientation perception before, during, and after saccades.
• Analyzed how retinal image rotation and predictive remapping influence perceived orientation.

Main Results:

• Orientation perception was primarily driven by the rotated retinal image.
• Evidence of presaccadic remapping that stabilizes retinocentric perception during saccades.
• This remapping maintained a stable, albeit spatially inaccurate, perception.

Conclusions:

• Perceptual stability depends on predictive remapping of retinocentric signals in three dimensions.
• The brain actively compensates for ocular torsion to maintain a stable visual world.
• This study highlights the integrated nature of spatial and feature remapping in vision.