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Related Experiment Video

Updated: May 24, 2026

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Published on: February 23, 2024

Effects of retinal eccentricity and acuity on global-motion processing.

Jeffrey D Bower¹, Zheng Bian, George J Andersen

¹Department of Psychology, University of California Riverside, Riverside, CA 92521, USA.

Attention, Perception & Psychophysics

|March 3, 2012

Summary

Motion discrimination worsens with increasing retinal eccentricity and noise, independent of visual acuity. This suggests peripheral vision processing changes, not just reduced detail resolution.

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Area of Science:

Vision Science
Neuroscience
Perception

Background:

Visual performance declines in the retinal periphery.
Understanding how motion perception is affected by eccentricity is crucial for visual processing models.

Purpose of the Study:

To assess direction discrimination of moving stimuli at various retinal eccentricities.
To investigate the relationship between motion discrimination and Landolt-C acuity in the periphery.
To model the underlying mechanisms of peripheral motion processing changes.

Main Methods:

Direction discrimination using random-dot cinematograms.
Landolt-C acuity measurements at 0, 8, 22, and 40 degrees eccentricity.
Psychophysical modeling to explain observed performance changes.

Main Results:

Discrimination thresholds increased significantly with retinal eccentricity.
Increased directional variance (noise) also elevated discrimination thresholds.
These effects on motion discrimination were independent of changes in Landolt-C acuity.

Conclusions:

Peripheral vision's motion processing is impaired by eccentricity and noise.
Increased channel bandwidth and internal multiplicative noise likely underlie these peripheral deficits.
Motion discrimination changes are distinct from acuity changes in the retinal periphery.