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

Do alignment thresholds define a critical boundary in long-range detection facilitation with co-linear lines?

B Dresp1

  • 1Laboratoire de Systèmes BioMécaniques et Cognitifs, IMF, UMR 7507 du CNRS, Université Louis Pasteur, Ecole Nationale Supérieure de Physique de Strasbourg, Illkirch, France. birgitta.dresp@ensps.u-strasbg.fr

Spatial Vision
|April 20, 2001
PubMed
Summary

Line contrast detection is significantly enhanced when target lines are perceptually collinear with context lines. This visual facilitation diminishes at alignment thresholds, supporting models of contour integration.

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

Response times to Ehrenstein illusions of varying subjective magnitude: complementarity of psychophysical measures.

Psychonomic bulletin & review·2002
Same author

Asymmetrical contrast effects induced by luminance and color configurations.

Perception & psychophysics·2002
Same author

The brain may know more than cognitive theory can tell us: a reply to Ted Parks.

Perception·2001
Same author

Spatial facilitation by color and luminance edges: boundary, surface, and attentional factors.

Vision research·2000
Same author

Dynamic characteristics of spatial mechanisms coding contour structures.

Spatial vision·1999
Same author

The effect of practice on the visual detection of near-threshold lines.

Spatial vision·1998

Area of Science:

  • Visual perception
  • Computational neuroscience
  • Psychophysics

Background:

  • Human visual system excels at integrating local features into coherent percepts.
  • Understanding contour integration is key to explaining object recognition.
  • Long-range interactions play a crucial role in visual processing.

Purpose of the Study:

  • To investigate the influence of spatial alignment on line contrast detection.
  • To determine the relationship between alignment thresholds and contrast detection facilitation.
  • To test the independence of these effects from various stimulus parameters.

Main Methods:

  • Two-alternative temporal forced-choice procedure to measure contrast detection thresholds.
  • Systematic variation of target line position relative to collinear context lines.

Related Experiment Videos

  • Manipulation of contrast polarity, line length, and separation between lines.

    • Main Results:

    • Strong facilitation in line contrast detection observed at perceptually collinear positions.
    • Facilitation decreased significantly at horizontal offsets near the alignment threshold.
    • Effects were independent of contrast polarity, line length, and separation (above 20 arc min).

    Conclusions:

    • Alignment thresholds define a critical boundary for collinear facilitation in line detection.
    • Findings support models of contour integration involving interactions of contrast, orientation, and alignment.
    • These mechanisms contribute to the perception of both virtual and object contours.