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

Detecting shape deformation of moving patterns.

G Loffler1, H R Wilson

  • 1Centre for Vision Research, 103 Farquharson Bldg., York University, 4700 Keele St., Ont., M3J 1P3, Toronto, Canada. loffler@hpl.crestech.ca

Vision Research
|April 13, 2001
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

The Spherical Tokamak for Energy Production: theme issue introduction.

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences·2024
Same author

Nonlinear Kinetic Ion Response to Small Scale Magnetic Islands in Tokamak Plasmas: Neoclassical Tearing Mode Threshold Physics.

Physical review letters·2018
Same author

Nonlinear Stability and Saturation of Ballooning Modes in Tokamaks.

Physical review letters·2016
Same author

Explosive instability and erupting flux tubes in a magnetized plasma.

Proceedings. Mathematical, physical, and engineering sciences·2015
Same author

Rapid, minimally invasive adult voluntary male circumcision: A randomised trial.

South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde·2013
Same author

Kinetic instabilities that limit β in the edge of a tokamak plasma: a picture of an H-mode pedestal.

Physical review letters·2012
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

This study investigated how humans perceive shape deformation in rotating patterns. Thresholds for discriminating pattern changes were found to depend on the number of visible pattern parts, not just the overall shape or amount of visible pattern.

Area of Science:

  • Visual perception
  • Computational neuroscience
  • Pattern recognition

Background:

  • Understanding how the visual system processes complex motion and shape is crucial.
  • Previous research has explored sensitivity to rotating stimuli, but the role of local versus global processing in deformation detection remains unclear.

Purpose of the Study:

  • To measure thresholds for discriminating rigidly and non-rigidly rotating 2D patterns.
  • To investigate the influence of local computations versus global pooling on shape deformation sensitivity.
  • To identify neural mechanisms underlying the computation of shape deformation.

Main Methods:

  • Stimuli were closed contours formed by the sum of two radial frequency components.
  • Sensitivity to deformation was measured as a function of differing angular velocities.

Related Experiment Videos

  • Aperture paradigms and simultaneous masking were used to probe local and global processing and underlying mechanisms.

    • Main Results:

    • Discrimination thresholds were independent of the specific pattern shape.
    • Thresholds depended on the number of visible pattern segments (apertures), not solely on the total visible pattern area.
    • Sensitivity to deformation could not be explained by purely local computations or linear global summation.
    • 1D masks had minimal effect, while rotating and expanding motion masks significantly impaired sensitivity.

    Conclusions:

    • Shape deformation detection involves complex interactions between local and global visual processing.
    • Detectors sensitive to radial and circular motion appear to be involved in computing shape deformation.
    • The findings suggest a sophisticated mechanism for processing dynamic shape changes in the visual system.