Evidence map›Paper›PMID 24581047›Full record

ArticleDevelopmental science2014

Understanding the mapping between numerical approximation and number words: evidence from Williams syndrome and typical development.

Melissa E Libertus, Lisa Feigenson, Justin Halberda, Barbara Landau

Abstract read
In one paragraph

Article in Developmental science, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.

0numbers the graph read from it
0cells of the map it votes in
15citing papers in PubMed
2.7field-weighted citation impact, top 9% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

15 citing papers in PubMed, 34 citations in OpenAlex.

  1. Review
  2. Logic and felicity in the face of intellectual disability: linguistic scales and Williams syndrome.Language learning and development : the official journal of the Society for Language Development · 2026
    Article
  3. Review
  4. Article
  5. Article
  6. Article
  7. Review
  8. Article
  9. Article
  10. Understanding Number Line Estimation in Williams Syndrome and Down Syndrome.Journal of autism and developmental disorders · 2020
    Article
  11. Article
  12. Article
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  15. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 1 institution in 1 country.

Melissa E LibertusDepartment of Psychological and Brain Sciences, Johns Hopkins University, USA; Department of Psychology, Learning Research and Development Center, University of Pittsburgh, USA.
Lisa Feigenson
Justin Halberda
Barbara Landau
Johns Hopkins University · US

Funding

Spatial Representation in Williams SyndromeR01NS050876 · NINDS · JOHNS HOPKINS UNIVERSITY · PI LANDAU, BARBARA · 2005 to 2009
$1.7M
Development and Function of Nonverbal Number ApproximationR01HD057258 · NICHD · JOHNS HOPKINS UNIVERSITY · PI FEIGENSON, LISA, HALBERDA, JUSTIN · 2009 to 2013
$1.6M
NICHD NIH HHS R01 HD057258NINDS NIH HHS R01 NS050876
6 · The paper itself

Abstract

All numerate humans have access to two systems of number representation: an exact system that is argued to be based on language and that supports formal mathematics, and an Approximate Number System (ANS) that is present at birth and appears independent of language. Here we examine the interaction between these two systems by comparing the profiles of people with Williams syndrome (WS) with those of typically developing children between ages 4 and 9 years. WS is a rare genetic deficit marked by fluent and well-structured language together with severe spatial deficits, deficits in formal math, and abnormalities of the parietal cortex, which is thought to subserve the ANS. One of our tasks, requiring approximate number comparison but no number words, revealed that the ANS precision of adolescents with WS was in the range of typically developing 2- to 4-year-olds. Their precision improved with age but never reached the level of typically developing 6- or 9-year-olds. The second task, requiring verbal number estimation using number words, revealed that the estimates produced by adolescents with WS were comparable to those of typically developing 6- and 9-year-olds, i.e. were more advanced than their ANS precision. These results suggest that ANS precision is somewhat separable from the mapping between approximate numerosities and number words, as the former can be severely damaged in a genetic disorder without commensurate impairment in the latter.

Indexed as

LanguageMathematicsAdolescentAdultAge FactorsAnalysis of VarianceChildChild, PreschoolComprehensionDevelopmental DisabilitiesFemaleHumansMaleNeuropsychological TestsSeverity of Illness IndexSpace Perception

Identifiers

PMID24581047
PMCPMC4150860
OpenAlexW2064826324

What OpenQuestion holds

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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.