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Related Concept Videos

Vision01:24

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Related Experiment Video

Updated: Jun 13, 2026

Using Looming Visual Stimuli to Evaluate Mouse Vision
05:07

Using Looming Visual Stimuli to Evaluate Mouse Vision

Published on: June 13, 2019

Vision senses number directly.

John Ross1, David C Burr

  • 1School of Psychology, University of Western Australia, Perth, WA, Australia. jr@psy.uwa.edu.au

Journal of Vision
|May 14, 2010
PubMed
Summary
This summary is machine-generated.

Observers can accurately judge the average number of items (numerosity) in a sequence, even when density varies. This demonstrates that numerosity perception is independent of texture density.

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Area of Science:

  • Visual perception
  • Psychophysics
  • Sensory attributes

Background:

  • Numerosity is proposed as a primary sensory attribute.
  • Numerosity perception is known to be susceptible to adaptation.
  • Previous research suggests numerosity and density may be processed differently.

Purpose of the Study:

  • To investigate if observers can extract a running average of numerosity.
  • To determine if numerosity judgments are independent of texture density.
  • To explore the relationship between numerosity, density, and luminance.

Main Methods:

  • Method of Single Stimuli was employed.
  • Observers judged numerosity or density relative to a running average.
  • Experiments involved intermingled and blocked conditions with varying density and numerosity.

Main Results:

  • Observers accurately extracted a running average of numerosity for comparison.
  • Numerosity judgments were as precise as density judgments across conditions.
  • Perceived numerosity increased with decreasing luminance, unlike density.

Conclusions:

  • Numerosity judgments can be made independently of texture density.
  • The visual system processes numerosity and density as distinct attributes.
  • Luminance influences numerosity perception, further supporting independent processing.