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Anisotropic representations of visual space modulate visual numerosity estimation.

Li L-Miao1, Bert Reynvoet2, Bilge Sayim3

  • 1Univ. Lille, CNRS, UMR9193 - SCALab - Sciences Cognitives et Sciences Affectives, F-59000 Lille, France; Faculty of Psychology and Educational Sciences, KU Leuven @Kulak, Kortrijk, Belgium.

Vision Research
|October 10, 2022
PubMed
Summary
This summary is machine-generated.

Numerosity perception, the ability to estimate visual items without counting, shows a radial-tangential anisotropy. This means how items are arranged (radially vs. tangentially) impacts number estimation, suggesting spatial vision

Keywords:
CrowdingNumerosity estimationRadial-tangential anisotropyRedundancy maskingSpatial vision

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Area of Science:

  • Cognitive Science
  • Visual Perception
  • Psychophysics

Background:

  • Numerosity perception, estimating quantities without counting, is crucial for visual processing.
  • Existing models often overlook visual field asymmetries, focusing on features like density and item size.
  • The visual field exhibits radial-tangential anisotropy, affecting spatial tasks like crowding and redundancy masking.

Purpose of the Study:

  • To investigate if numerosity perception is influenced by the radial-tangential anisotropy observed in spatial vision.
  • To explore the underlying topology of numerosity perception by examining the impact of visual field asymmetries.

Main Methods:

  • Experiment 1: Participants estimated the number of discs presented in radial or tangential arrangements.
  • Experiment 2: Participants identified groups of discs within the same radial or tangential displays.
  • Analysis focused on how disc arrangement affected numerosity estimation and perceived grouping.

Main Results:

  • Numerosity estimation was significantly influenced by the radial versus tangential arrangement of discs.
  • This finding suggests a radial-tangential anisotropy in numerosity perception.
  • Perceived grouping of discs did not appear to explain the observed anisotropy in number estimation.

Conclusions:

  • The topology of spatial vision, specifically radial-tangential anisotropy, modulates numerosity estimation.
  • Asymmetries within the visual field are critical factors to consider in the study of numerosity perception.
  • Future research should incorporate these spatial inhomogeneities to better understand quantity estimation.