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

Apparent phase reversal during stabilized image fading.

U Tulunay-Keesey1, B E Saleh, J N Ver Hoeve

  • 1Department of Ophthalmology, University of Wisconsin-Madison 53706.

Journal of the Optical Society of America. A, Optics and Image Science
|November 1, 1987
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

Implications of retinal effects observed in chronic toxicity studies on the clinical development of a CNS-active drug candidate.

Regulatory toxicology and pharmacology : RTP·2014
Same author

Image design: generation of a prescribed image at the output of a band-limited system.

IEEE transactions on pattern analysis and machine intelligence·2011
Same author

Reconstruction of a vibrating object from its time-averaged image intensities by the use of exponential filtering.

Applied optics·2010
Same author

Decentered Gaussian beams.

Applied optics·2010
Same author

Reconstruction of a complex-valued object in double-passage coherent imaging through a random-phase screen.

Applied optics·2010
Same author

Reconstruction of a complex-valued object in coherent imaging through a random-phase screen.

Applied optics·2010

Apparent phase reversal (APR) occurs when a stabilized visual pattern reappears with reversed contrast after the image disappears. This study quantizes the conditions and underlying visual gain mechanisms influencing APR.

Area of Science:

  • Visual perception
  • Neuroscience
  • Image processing

Background:

  • The difference of Gaussians (DOG) model describes visual patterns.
  • Retinal image stabilization is crucial for studying visual perception.
  • Apparent phase reversal (APR) indicates changes in local visual sensitivity.

Purpose of the Study:

  • To investigate the phenomenon of apparent phase reversal (APR).
  • To determine the relationship between stimulus timing, spatial characteristics, and APR.
  • To estimate parameters of the visual gain mechanism underlying APR.

Main Methods:

  • Utilizing a stabilized retinal image of a DOG pattern.
  • Applying a uniform luminance increment after image offset.
  • Measuring the threshold increment required to evoke APR across varying time delays and spatial constants.

Related Experiment Videos

Main Results:

  • The threshold for APR showed an exponential relationship with the time delay of the increment.
  • A minor dependence of APR threshold on the spatial dimensions of the DOG pattern was observed.
  • Data supported a spatial vision model incorporating a gain inversely proportional to filtered stimulus properties.

Conclusions:

  • APR is a quantifiable phenomenon linked to dynamic changes in visual sensitivity.
  • The study provides estimates for the time constant and spatial extent of the visual gain control mechanism.
  • Findings contribute to understanding the temporal and spatial dynamics of visual processing.