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

Opponent-motion mechanisms are self-normalizing.

Stéphane J M Rainville1, Walter L Makous, Nicholas E Scott-Samuel

  • 1Center for Vision Research, York University, 4700 Keele Street, North York, Ont., Canada M1J 1P3. rainvill@yorku.ca

Vision Research
|February 15, 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

Fiddler crabs (Afruca tangeri) detect second-order motion in both intensity and polarization.

Communications biology·2024
Same author

Interactions between color and gloss in iridescent camouflage.

Behavioral ecology : official journal of the International Society for Behavioral Ecology·2023
Same author

Beetle iridescence induces an avoidance response in naïve avian predators.

Animal behaviour·2023
Same author

Background complexity can mitigate poor camouflage.

Proceedings. Biological sciences·2021
Same author

The giant panda is cryptic.

Scientific reports·2021
Same author

Birds learn to avoid aposematic prey by using the appearance of host plants.

Current biology : CB·2021

This study investigated motion perception, finding that normalization signals for motion contrast are pooled locally, not remotely. These findings support local normalization processes in low-level motion detectors.

Area of Science:

  • Vision Science
  • Computational Neuroscience
  • Human Perception

Background:

  • The Adelson-Bergen motion energy model uses energy differences for motion perception.
  • Motion contrast, normalizing opponent motion energy by flicker energy, better describes human direction discrimination.
  • Previous work showed opponent-motion normalization is selective for flicker position, orientation, and spatial frequency.

Purpose of the Study:

  • To investigate the spatial properties of opponent-motion normalization using a superposition masking paradigm.
  • To compare superposition masking results with previous lateral masking data.
  • To determine if normalization signals are local or remote and their spatial characteristics.

Main Methods:

  • Employed a superposition masking paradigm to differentially activate normalization mechanisms.

Related Experiment Videos

  • Compared results with lateral masking data from a previous study.
  • Conducted additional experiments to assess the spatial pooling of normalization signals.

    • Main Results:

    • Selectivity for flicker orientation and spatial frequency varied among observers, but bandwidths were consistent across masking conditions.
    • Normalization signals are pooled within a spatial region matching local motion detector properties.
    • No evidence for remote normalization signals predicted by broadband inhibitory models was found.

    Conclusions:

    • Supports a local normalization process for motion contrast perception.
    • The spatial properties of normalization are inherited from low-level motion detectors.
    • Challenges broadband inhibitory models predicting remote normalization signals.