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Related Experiment Video

Updated: May 25, 2025

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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Monocular blur impairs heading judgements from optic flow.

William E A Sheppard1, Rachel O Coats1, Richard M Wilkie1

  • 1School of Psychology, Faculty of Medicine and Health, University of Leeds, UK.

I-Perception
|February 27, 2025
PubMed
Summary
This summary is machine-generated.

Monocular blur significantly impairs heading perception, especially when visual cues are degraded. This effect is most pronounced when both blur and poor optic flow occur together, impacting navigation.

Keywords:
actionblurcognitionheadingoptic flowperception

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Area of Science:

  • Vision science
  • Human locomotion
  • Perceptual psychology

Background:

  • Optic flow is crucial for determining heading during self-motion.
  • Monocular blur can affect locomotion, but the conditions are not fully understood.
  • The interaction between blur and optic flow quality on heading perception requires further investigation.

Purpose of the Study:

  • To investigate how monocular blur affects heading perception from optic flow.
  • To compare heading perception with monocular blur versus full vision under degraded optic flow conditions.
  • To determine if and when monocular blur impairs heading perception.

Main Methods:

  • Participants (N=52) performed heading perception tasks with rich or degraded optic flow.
  • Monocular blur was introduced using a Bangerter filter over the non-dominant eye.
  • Heading perception was assessed via a browser-based task using self-motion videos.

Main Results:

  • Monocular blur and degraded optic flow both increased heading error.
  • Combined monocular blur and degraded flow resulted in the worst performance.
  • Heading underestimation was larger with monocular blur and degraded flow.

Conclusions:

  • Monocular blur's impact on heading perception is evident under degraded optic flow conditions.
  • The richness of visual information and monocular blur interact to affect heading perception.
  • Findings are relevant for understanding navigation challenges in low-visibility scenarios.