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

Motion discrimination in two-frame sequences with differing spatial frequency content

M J Morgan1, G Mather

  • 1Department of Visual Science, Institute of Ophthalmology, London, England.

Vision Research
|January 1, 1994
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

Factors limiting quantitative phase retrieval in atomic-resolution differential phase contrast scanning transmission electron microscopy using a segmented detector.

Ultramicroscopy·2022
Same author

Lagged recovery of fish spatial distributions following a cold-water perturbation.

Scientific reports·2021
Same author

Suppressing dynamical diffraction artefacts in differential phase contrast scanning transmission electron microscopy of long-range electromagnetic fields via precession.

Ultramicroscopy·2020
Same author

High contrast at low dose using a single, defocussed transmission electron micrograph.

Micron (Oxford, England : 1993)·2019
Same author

Robotic vs. laparoscopic ventral mesh rectopexy for external rectal prolapse and rectal intussusception: a systematic review.

Techniques in coloproctology·2019
Same author

Chromatic adaptation from achromatic stimuli with implied color.

Attention, perception & psychophysics·2019
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

Spatial filtering affects motion discrimination. Blurring one frame of a random dot pattern impaired motion perception, suggesting it relies on feature intervals, not high spatial frequencies. This challenges previous theories.

Area of Science:

  • Visual perception
  • Computational neuroscience
  • Image processing

Background:

  • The upper threshold for directional motion discrimination (Dmax) is a key measure in visual perception.
  • Previous studies suggested Dmax is linked to high spatial frequencies in motion stimuli.

Purpose of the Study:

  • To investigate the role of spatial frequency filtering in directional motion discrimination.
  • To test whether Dmax is determined by high spatial frequencies or feature intervals.

Main Methods:

  • Measured Dmax using two-frame random dot kinematograms with Gaussian spatial low-pass filtering applied to one or both frames.
  • Analyzed the correlation between features in blurred and unblurred patterns.
  • Manipulated frame duration to test processing-delay hypotheses.

Related Experiment Videos

Main Results:

  • When both frames were blurred, Dmax increased with blurring, consistent with prior work.
  • Blurring only one frame had minimal effect below 20 min arc, but motion discrimination became impossible at larger space constants.
  • A temporal order asymmetry emerged at critical blur levels, favoring low-pass patterns preceding broadband patterns.

Conclusions:

  • Dmax is likely determined by the spatial interval between features after pre-filtering, not preferentially by high spatial frequencies.
  • The breakdown in discrimination and temporal asymmetry suggest a processing delay in visual motion perception, possibly related to sustained vs. transient signals or inhibitory surround activation.