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Width discrimination for band-pass stimuli.

D W Heeley1, B Timney, I R Paterson

  • 1Department of Psychology, University of St. Andrews, Fife, Scotland, U.K.

Vision Research
|January 1, 1989
PubMed
Summary
This summary is machine-generated.

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Researchers investigated the Weber fraction for width using difference of Gaussian (DOG) luminance distributions. Findings indicate the discrimination function for width is continuous, not segmented, across various target sizes.

Area of Science:

  • Visual perception
  • Psychophysics
  • Computational neuroscience

Background:

  • Discrepancies exist regarding the continuity of the width discrimination function in relation to target size.
  • Previous studies by Hirsch & Hylton (1982) and Mayer & Kim (1986) offered conflicting evidence.

Purpose of the Study:

  • To determine the Weber fraction for width using difference of Gaussian (DOG) luminance distributions.
  • To investigate whether the discrimination function for width is continuous or segmented as a function of target size.

Main Methods:

  • Collected simultaneous data for seven different standard widths.
  • Measured the Weber fraction for width across varying target sizes.
  • Analyzed data for both foveal and 2.0 degrees eccentricity conditions.

Related Experiment Videos

Main Results:

  • The Weber fraction for width varied with target size.
  • No evidence of discontinuities was found in the discrimination function.
  • Results held true for both foveal and eccentric viewing conditions.

Conclusions:

  • The discrimination function for width appears to be continuous, not segmented, with respect to target size.
  • This study provides evidence against a segmented model for width discrimination.
  • The findings contribute to understanding visual processing of spatial information.