Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

"Phase capture" in amblyopia: the influence function for sampled shape.

Dennis M Levi1, Roger W Li, Stanley A Klein

  • 1University of California, Berkeley, School of Optometry & Helen Wills Neuroscience Institute, Berkeley, CA 94720-2020, USA. dlevi@berkeley.edu

Vision Research
|March 31, 2005
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Selective Attention Dynamics in Adults With Attention-Deficit/Hyperactivity Disorder: A Role for Sensory Processing Asymmetry?

Biological psychiatry global open science·2026
Same author

Reduced visual acuity disrupts fixational stability but fails to fully capture amblyopic eye movements.

Optometry and vision science : official publication of the American Academy of Optometry·2026
Same author

Recovery of depth perception in adults with abnormal binocular vision.

Vision research·2026
Same author

The best stereoacuity is rarely at the fovea.

Vision research·2025
Same author

Emerging therapies for improving stereoacuity in amblyopia. A systematic review and meta-analysis.

Vision research·2025
Same author

Vergence anomalies are associated with impaired stereopsis in amblyopia.

Vision research·2025
Same journal

Computational and mathematical models in vision: Quantitative approaches to understanding visual perception.

Vision research·2026
Same journal

Complex interactions between lightness, chroma, and hue in color ensemble perception.

Vision research·2026
Same journal

Driving with autism spectrum disorder: Exploring the impact of tactile hazard warnings on gaze behavior and hazard responses.

Vision research·2026
Same journal

Early visual processing in adults with ADHD: evidence from contrast sensitivity, spatial integration, and external noise.

Vision research·2026
Same journal

Pupil reflexes generate the peripheral drift illusion due to ON/OFF motion responses.

Vision research·2026
Same journal

Perceived direction of glass patterns can flip by 90°: A neural model.

Vision research·2026
See all related articles

Amblyopic individuals struggle with shape discrimination, making larger perceptual errors than normal observers. Some amblyopes rely more on outer contour cues, possibly due to abnormal crowding effects.

Area of Science:

  • Vision Science
  • Perceptual Psychology
  • Neuroscience

Background:

  • Amblyopia, or 'lazy eye', affects visual acuity and depth perception.
  • Understanding how visual information is processed in amblyopia is crucial for developing effective interventions.
  • Previous research indicates altered visual processing in amblyopic individuals, but specific cue utilization for shape perception remains unclear.

Purpose of the Study:

  • To investigate which stimulus information amblyopic individuals use to judge object shape.
  • To measure the influence of phase shifts in contour-defining elements on shape perception in amblyopia.
  • To compare cue utilization for shape discrimination between amblyopic and normal observers.

Main Methods:

  • Utilized a contour defined by four Gabor patches with a central test patch.

Related Experiment Videos

  • Manipulated phase shifts in inner and outer patch pairs to measure their influence on perceived shape.
  • Employed linear multiple regression to quantify the weighting of different visual cues (inner/outer patch phase, outer patch envelope).

    • Main Results:

    • Amblyopes exhibited elevated shape discrimination thresholds and larger perceptual biases compared to controls.
    • While normal observers showed strong 'phase capture' from inner patches, some amblyopes demonstrated reduced sensitivity to inner patches.
    • Surprisingly, several amblyopic observers showed significant sensitivity to the phase and envelope of outer patches, unlike normal observers.

    Conclusions:

    • Amblyopic shape discrimination is imprecise, with significant biases, especially for curved shapes.
    • Amblyopic observers may rely more heavily on outer contour cues and less on inner cues, potentially due to abnormal crowding.
    • Findings suggest distinct visual information processing strategies in amblyopia, impacting shape perception.