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Related Experiment Video

Updated: Jun 17, 2026

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
07:24

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane

Published on: August 22, 2025

Orientation uncertainty reduces perceived obliquity.

Alessandro Tomassini1, Michael J Morgan, Joshua A Solomon

  • 1Optometry Department, City University, London, UK.

Vision Research
|December 17, 2009
PubMed
Summary
This summary is machine-generated.

Visual perception is biased towards vertical and horizontal orientations. When visual input is uncertain, this bias for cardinal directions becomes stronger, influencing our estimates of visual stimuli.

Related Experiment Videos

Last Updated: Jun 17, 2026

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
07:24

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane

Published on: August 22, 2025

Area of Science:

  • Visual perception
  • Cognitive psychology
  • Computational neuroscience

Background:

  • Perceptual biases can arise from prior experience and environmental statistics.
  • The influence of prejudice on perception is expected to be maximal under conditions of low stimulus certainty.

Purpose of the Study:

  • To investigate visual biases for cardinal orientations (vertical and horizontal).
  • To determine how stimulus uncertainty modulates these perceptual biases.

Main Methods:

  • Manipulated the variance of orientations in arrays of grating patches to control stimulus certainty.
  • Measured estimates of the mean orientation in response to these arrays.

Main Results:

  • Increased orientation variance led to estimates of the mean becoming less oblique.
  • This indicates a stronger bias towards cardinal orientations when stimulus information was less certain.

Conclusions:

  • The visual system exhibits a stable prior, or prejudice, for vertical and horizontal orientations.
  • These findings align with the prevalence of cardinal orientations in natural scenes and their role in visual processing.