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Related Concept Videos

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Eccentricity of an Ellipse

An ellipse is a fundamental conic section defined by the constant sum of distances from any point on its curve to two fixed points, known as the foci. This geometric property can be physically demonstrated using a pencil, string, and two pins. By anchoring the string at both ends and maintaining it taut with a pencil, one can trace the outline of an ellipse.The shape and extent of the ellipse are determined by its eccentricity, e, defined as the ratio of the distance between the center and a...
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Related Experiment Video

Updated: May 26, 2026

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes
06:25

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Published on: February 23, 2024

Why do shape aftereffects increase with eccentricity?

Elena Gheorghiu1, Frederick A A Kingdom, Jason Bell

  • 1Laboratory of Experimental Psychology, University of Leuven, Leuven, Belgium. elena.gheorghiu@psy.kuleuven.be

Journal of Vision
|December 22, 2011
PubMed
Summary
This summary is machine-generated.

Shape aftereffects, like shape-frequency and shape-amplitude aftereffects, intensify with visual field eccentricity. This perceptual shift is scale-independent and suggests eccentricity-dependent changes in visual processing mechanisms.

Related Experiment Videos

Last Updated: May 26, 2026

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes
06:25

Motion-Acuity Test for Visual Field Acuity Measurement with Motion-Defined Shapes

Published on: February 23, 2024

Area of Science:

  • Visual perception
  • Neuroscience
  • Psychophysics

Background:

  • Spatial aftereffects are known to increase with visual field eccentricity.
  • Previous research has established eccentricity-dependent changes in visual processing.

Purpose of the Study:

  • To investigate whether shape-frequency and shape-amplitude aftereffects also increase with eccentricity.
  • To determine the influence of stimulus size and display structure on these aftereffects.
  • To explore the underlying mechanisms contributing to eccentricity-dependent aftereffects.

Main Methods:

  • Participants adapted to sinusoidal-shaped contours and then judged the shape of test stimuli.
  • Stimulus size and distance between stimuli during adaptation and testing were systematically varied.
  • Perceptual shifts and discrimination thresholds were measured at different eccentricities.

Main Results:

  • Shape-frequency and shape-amplitude aftereffects significantly increase with eccentricity.
  • The perceptual shifts were found to be scale-independent across different stimulus sizes.
  • Adaptation effects showed similar temporal decline rates across the visual field, with higher thresholds in the periphery.

Conclusions:

  • The findings support the hypothesis that visual processing mechanisms involved in shape perception become less sensitive with eccentricity.
  • An eccentricity-dependent increase in the bandwidth of shape-selective mechanisms may explain the observed results.
  • These results highlight the significant impact of visual field location on shape perception and adaptation.