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Perceiving numerosity from birth.

Maria Dolores de Hevia1, Elisa Castaldi2, Arlette Streri1

  • 1Université Paris Descartes,Sorbonne Paris Cité,75006 Paris,Franceveronique.izard@parisdescartes.fr.

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Humans can perceive exact numbers from birth, despite potential biases from visual cues like item size or density. This innate ability suggests a fundamental understanding of quantity beyond mere physical attributes.

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Area of Science:

  • Cognitive psychology
  • Developmental psychology
  • Neuroscience

Background:

  • Numerosity perception is the ability to assess the quantity of items.
  • Non-numerical stimulus features (e.g., size, density) can influence numerosity judgments.
  • The origins and nature of innate numerosity perception remain debated.

Purpose of the Study:

  • To discuss the nature and origins of numerosity perception.
  • To address the influence of non-numerical features on quantity representation.
  • To present evidence for innate human numerosity perception.

Main Methods:

  • Review of existing literature on numerosity perception.
  • Analysis of studies investigating infant perception of quantity.
  • Discussion of experimental findings on numerical and non-numerical stimulus properties.

Main Results:

  • Non-numerical stimulus characteristics demonstrably bias numerosity perception.
  • Evidence suggests humans possess an innate ability to perceive and represent numerosities from birth.
  • This perception extends beyond non-numerical quantitative features like size and density.

Conclusions:

  • Human infants possess an early-emerging capacity for representing numerical information.
  • Numerosity perception is distinct from, though influenced by, non-numerical stimulus properties.
  • Further research is needed to fully elucidate the developmental trajectory of quantity representation.