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

Sharpness overconstancy in peripheral vision

S J Galvin1, R P O'Shea, A M Squire

  • 1Department of Psychology, University of Otago, Dunedin, New Zealand. galvin@psy.otago.ac.nz

Vision Research
|August 1, 1997
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

On binocular alternation.

Perception·2001
Same author

Sharpness overconstancy: the roles of visibility and current context.

Vision research·1999
Same author

Colour at edges and colour spreading in McCollough effects.

Vision research·1999
Same author

The effect of spatial frequency and field size on the spread of exclusive visibility in binocular rivalry.

Vision research·1997
Same author

Blur and contrast as pictorial depth cues.

Perception·1997
Same author

The spatial grain of motion perception in human peripheral vision.

Vision research·1996
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

Peripheral vision appears sharper than it is, an effect termed "sharpness overconstancy." This phenomenon was observed consistently across various eccentricities, suggesting a unique processing of visual sharpness in the periphery.

Area of Science:

  • Visual perception
  • Neuroscience
  • Psychophysics

Background:

  • Extensive research exists on peripheral vision's spatial sampling and filtering.
  • However, the perceived clarity or apparent sharpness of the peripheral visual field remains understudied.

Purpose of the Study:

  • To investigate the apparent sharpness of visual stimuli presented in the peripheral visual field.
  • To quantify the relationship between stimulus blur, eccentricity, and perceived sharpness.

Main Methods:

  • Gaussian blurred horizontal edges were presented at eccentricities ranging from 8.3 to 40 degrees.
  • Observers matched the perceived sharpness of peripheral stimuli by adjusting a foveally viewed stimulus.
  • Stimulus field size was manipulated, including scaling by the cortical magnification factor.

Related Experiment Videos

Main Results:

  • All observers perceived peripheral stimuli as sharper than their foveal matches, a phenomenon termed "sharpness overconstancy."
  • Sharpness overconstancy increased with eccentricity for a fixed field size.
  • When field size was scaled by the cortical magnification factor, sharpness overconstancy became independent of eccentricity.
  • A slight sharpness underconstancy was noted for minimally blurred peripheral edges.

Conclusions:

  • The visual system consistently overestimates the sharpness of peripheral stimuli.
  • Cortical magnification plays a role in normalizing the perception of sharpness across eccentricities.
  • Further research is needed to elucidate the underlying mechanisms of peripheral sharpness overconstancy.