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The radial-tangential anisotropy of numerosity perception
Li L-Miao1,2,3, Bert Reynvoet2,4,5, Bilge Sayim1,6
1Université de Lille, CNRS, UMR 9193-SCALab-Sciences Cognitives et Sciences Affectives, Lille, France.
Journal of Vision
|July 24, 2024
Summary
Numerosity perception is biased by visual field differences. Radial arrangements of items appear less numerous than tangential ones due to peripheral vision
Area of Science:
- Visual perception
- Cognitive neuroscience
- Psychophysics
Background:
- Human visual field representation differs between foveal and peripheral vision.
- Peripheral vision exhibits radial-tangential anisotropy, affecting perceptual interference.
- Previous studies show radial arrangements interfere more than tangential ones.
Purpose of the Study:
- To investigate the impact of radial-tangential anisotropy on numerosity perception.
- To determine if display arrangement influences the estimation of item quantities.
Main Methods:
- Four experiments presented visual displays with varying numbers of discs.
- Discs were predominantly arranged radially (high interference) or tangentially (low interference).
- Participants reported the number of discs in each display.
Main Results:
- Radial displays were consistently perceived as less numerous than tangential displays.
- This effect held across different levels of radial and tangential manipulation.
- Mixed contrast polarity discs also showed the same pattern.
Conclusions:
- Numerosity perception demonstrates a significant radial-tangential anisotropy.
- This anisotropy arises from local spatial interactions between visual items in peripheral vision.
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