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Related Experiment Video

Updated: Oct 22, 2025

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
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Implicit visuospatial attention shapes numerosity adaptation and perception.

Paolo A Grasso1,2, Giovanni Anobile1,3, Camilla Caponi1,4

  • 1Department of Neuroscience, Psychology, Pharmacology and Child Health, University of Florence, Florence, Italy.

Journal of Vision
|August 27, 2021
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Summary
This summary is machine-generated.

Numerosity adaptation, the underestimation of dot counts after viewing a dense array, is reduced by concurrent stimuli. This suggests attention influences how we perceive quantity.

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Area of Science:

  • Cognitive psychology
  • Visual perception
  • Neuroscience

Background:

  • Perception of numerical quantities is subject to adaptation, leading to underestimation after exposure to numerous stimuli.
  • Previous work indicated that introducing a neutral stimulus reduces this adaptation magnitude.

Purpose of the Study:

  • To investigate the role of attentional resources in numerosity adaptation.
  • To determine if attention differentially affects adaptation for numerical versus non-numerical visual features.

Main Methods:

  • Replication of previous findings on adaptation reduction with additional stimuli (Experiment 1).
  • Magnitude estimation to assess numerosity underestimation with concurrent stimuli (Experiment 2).
  • Comparison with adaptation and estimation of visual orientation.

Main Results:

  • An additional, even neutral, stimulus significantly reduced numerosity adaptation.
  • Numerosity was underestimated when a second, irrelevant numerical stimulus was present.
  • Orientation adaptation and estimation accuracy were unaffected by similar manipulations.

Conclusions:

  • Numerosity adaptation is influenced by the deployment of attentional resources, specifically visuospatial attention.
  • Adaptation magnitude depends on perceived, not just physical, numerosity.
  • Attention's impact on adaptation may vary across different visual feature processing hierarchies.