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Developmental change in the acuity of the "number sense": The approximate number system in 3-, 4-, 5-, and 6-year-olds and adults.

Halberda, Justin, Feigenson, Lisa·2008·Developmental Psychology

Abstract

Behavioral, neuropsychological, and brain imaging research points to a dedicated system for processing number that is shared across development and across species. This foundational Approximate Number System (ANS) operates over multiple modalities, forming representations of the number of objects, sounds, or events in a scene. This system is imprecise and hence differs from exact counting. Evidence suggests that the resolution of the ANS, as specified by a Weber fraction, increases with age such that adults can discriminate numerosities that infants cannot. However, the Weber fraction has yet to be determined for participants of any age between 9 months and adulthood, leaving its developmental trajectory unclear. Here we identify the Weber fraction of the ANS in 3-, 4-, 5-, and 6-year-old children and in adults. We show that the resolution of this system continues to increase throughout childhood, with adultlike levels of acuity attained surprisingly late in development.

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Metadata

Authors
Halberda, J., & Feigenson, L.
Venue
Developmental Psychology
Published
2008
Volume
44
Issue
5
Pages
1457-1465
ISSN
  • 0012-1649 (ISSN-L)
  • 1939-0599
OpenAlex
W2097058229
Cited by
967
References
5
FWCI
20.18
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Developmental change in the acuity of the "number sense": The approximate number system in 3-, 4-, 5-, and 6-year-olds and adults. https://app.cochat.ai/papers/10.1037/a0012682
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Halberda, J., & Feigenson, L. (2008). Developmental change in the acuity of the "number sense": The approximate number system in 3-, 4-, 5-, and 6-year-olds and adults. Developmental Psychology. https://doi.org/10.1037/a0012682

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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