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

Discrimination of spatial phase changes: contrast and position codes.

D R Badcock1

  • 1Department of Experimental Psychology, Oxford University, UK.

Spatial Vision
|January 1, 1988
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

Foveal contrast processing of increment and decrement targets is equivalently reduced in glaucoma.

The British journal of ophthalmology·2008
Same author

Motion perception in migraineurs: abnormalities are not related to attention.

Cephalalgia : an international journal of headache·2006
Same author

Do migraineurs have difficulty judging direction of simulated heading?

Cephalalgia : an international journal of headache·2006
Same author

Motion processing deficits in migraine.

Cephalalgia : an international journal of headache·2004
Same author

An analysis of the factors associated with visual field deficits measured with flickering stimuli in-between migraine.

Cephalalgia : an international journal of headache·2004
Same author

Independent first- and second-order motion energy analyses of optic flow.

Psychological research·2001
Same journal

Comment on 'angle illusion on a picture's surface' by Hammad et al. (2008).

Spatial vision·2009
Same journal

Feature-based attentional modulation increases with stimulus separation in divided-attention tasks.

Spatial vision·2009
Same journal

Spatial distance between target and irrelevant patch modulates detection in a texture segmentation task.

Spatial vision·2009
Same journal

Inhibition related impairments of coherent motion perception in the attention-induced motion blindness paradigm.

Spatial vision·2009
Same journal

Recognition units in reading: backward masking experiments.

Spatial vision·2009
Same journal

Spatial-temporal modeling of interactive image interpretation.

Spatial vision·2009
See all related articles

The visual system does not explicitly process spatial phase. Experiments show that manipulating stimulus phase, while varying local contrast, impairs spatial localization, indicating reliance on contrast cues.

Area of Science:

  • Visual perception
  • Computational neuroscience
  • Psychophysics

Background:

  • Spatial phase and local contrast are crucial visual stimulus properties.
  • Distinguishing the visual system's coding of spatial phase versus contrast and position cues is challenging.

Purpose of the Study:

  • To investigate whether the human visual system explicitly codes spatial phase.
  • To differentiate the roles of spatial phase, local contrast, and position in visual perception.

Main Methods:

  • Utilized stimuli that are products of a sinusoidal carrier and a spatial envelope.
  • Assessed observer performance in detecting the leftward position of stimuli with varying carrier shifts.
  • Manipulated carrier shifts to alter phase differences and local contrast variations.

Related Experiment Videos

Main Results:

  • Observer performance in detecting stimulus position worsened over a specific range of carrier shifts.
  • Increased carrier shifts led to greater phase differences but reduced local contrast.
  • The observed performance decrement suggests a reliance on contrast cues over explicit phase coding.

Conclusions:

  • The human visual system does not appear to explicitly code spatial phase.
  • Local contrast and position cues play a significant role in spatial localization tasks.
  • Findings suggest that phase information is likely derived from contrast and position cues.