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

Spatial localization of motion-defined and luminance-defined contours

T Banton1, D M Levi

  • 1College of Optometry, University of Houston, TX 77204-6052.

Vision Research
|November 1, 1993
PubMed
Summary

Vernier alignment thresholds for luminance and motion-defined contours were measured. Results suggest parallel, independent mechanisms for localizing these distinct visual targets, influenced by contrast and sample limitations.

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

Binocular combination of stimulus orientation.

Royal Society open science·2016
Same author

A Case Report of Severe Hepatic Artery Vasospasm Induced by Hepatic Arterial Buffer Response After Liver Transplantation.

Transplantation proceedings·2016
Same author

Extra-anatomical Meso-portal Venous Jump Graft Repair for Early Portal Vein Thrombosis After Liver Transplant in an Infant With a Hypoplastic Portal Vein: A Case Report.

Transplantation proceedings·2016
Same author

Citrulline level is a potent indicator of acute rejection in the long term following pediatric intestinal/multivisceral transplantation.

American journal of transplantation : official journal of the American Society of Transplantation and the American Society of Transplant Surgeons·2012
Same author

MicroRNA signature of intestinal acute cellular rejection in formalin-fixed paraffin-embedded mucosal biopsies.

American journal of transplantation : official journal of the American Society of Transplantation and the American Society of Transplant Surgeons·2011
Same author

Split liver transplantation.

Transplantation proceedings·2011

Area of Science:

  • Visual perception
  • Computational neuroscience
  • Image processing

Background:

  • Vernier acuity measures the precision of spatial alignment.
  • Contour perception can be driven by luminance or motion cues.
  • Understanding distinct visual processing pathways is crucial.

Purpose of the Study:

  • To compare the precision of localizing luminance-defined versus motion-defined contours.
  • To investigate the underlying mechanisms of contour localization.
  • To determine if luminance and motion cues utilize shared or independent neural pathways.

Main Methods:

  • Measured vernier alignment thresholds for luminance and random-dot motion contours.
  • Varied dot density and perceived contrast of targets.

Related Experiment Videos

  • Investigated length summation effects and spatial interference from flanking bars.

    • Main Results:

    • Motion-defined contours were localized less precisely than luminance-defined contours.
    • Thresholds became equivalent when matched for dot density and contrast.
    • Localization precision is limited by contrast and sampling for motion cues.
    • Localization mechanisms for luminance and motion contours appear independent based on interference paradigms.

    Conclusions:

    • Visual system employs parallel, independent mechanisms for localizing luminance-defined and motion-defined contours.
    • Motion-defined contour localization is constrained by contrast and sampling.
    • Shared mechanisms may exist for basic spatial summation but not for higher-level contour integration.