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Number As a Primary Perceptual Attribute: A Review.

Giovanni Anobile1, Guido Marco Cicchini2, David C Burr3

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

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Humans share nonverbal quantity estimation with animals. New research suggests a distinction between sparse and dense visual stimuli, impacting numerosity perception and math skills.

Keywords:
Numerosityapproximate number systemnumerical cognitionsubitizingtexture density

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Comparative Cognition

Background:

  • Humans and animals share nonverbal quantity estimation (numerosity).
  • Traditionally, numerosity perception is divided into subitizing (small quantities) and estimation (larger quantities).
  • Recent research indicates a further division based on stimulus density.

Purpose of the Study:

  • To review evidence for a new division in numerosity perception.
  • To differentiate between sparse and densely packed visual stimuli.
  • To explore the psychophysical properties and neural underpinnings of these regimes.

Main Methods:

  • Review of psychophysical studies on numerosity discrimination.
  • Analysis of stimulus properties like density, eccentricity, and luminance.
  • Correlation analysis with formal mathematical abilities.

Main Results:

  • Two distinct regimes of numerosity perception exist: sparse (individuated items) and dense (texture).
  • These regimes follow different psychophysical laws and depend on visual factors.
  • Numerosity estimation, unlike texture perception, is linked to formal mathematical skills when stimuli are not too crowded.

Conclusions:

  • A critical distinction exists between perceiving discrete quantities and dense textures.
  • This distinction is crucial for understanding the relationship between nonverbal number sense and mathematical cognition.
  • The ability to discriminate numerosity, independent of texture, is a key correlate of mathematical aptitude.