DD children's deficit in non-symbolic number magnitude processing appears only in studies of older children (10 years and above), not younger ones¶
Claim · All claims
Evidence · 1 study · theoreticalr3·q2
Currency · newest study 2011 · checked against its sources 2026-10-20 (automated, 1 of 1 entry) · not reviewed by a person · overdue for a recheck since 2016: baselines and conditions change
Subclaims¶
Reading the evidence codes
q is the design tier, i the impact, n the sample, and the kind with its r
the rigour judged within that kind: what each code means.
This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.
q2 i? Only studies testing children aged 10 and above found significant DD-control differences in non-symbolic magnitude comparison; studies of 6- to 9-year-olds did not. → Noël M-P and Rousselle L 2011
Evidence¶
Noël M-P and Rousselle L 2011¶
Noël M-P and Rousselle L (2011) Developmental changes in the profiles of dyscalculia: an explanation based on a double exact-and-approximate number representation model. Front. Hum. Neurosci. 5:165. https://doi.org/10.3389/fnhum.2011.00165
q2 · i? · theoretical · r3
Narrative review synthesis ordering non-symbolic comparison studies by participants' age. The review reports a dissociation between younger (6–9 years) and older (10+) samples, with only the latter showing significant differences; no effect sizes are printed.
"for tasks using non-symbolic numbers, a dissociation appears between the studies which tested younger (6–9 years old) versus older children (10 years old and above): only the latter showed some significant difference"
Discussion¶
Learner Variables¶
- Age and Developmental Stage — moderator: an instructional effect differs with it
- Number Sense — outcome: instruction changes it
Related Claims¶
- The authors hypothesize DD children's first deficit is dysfunction in building the exact representation of symbolic numbers, with reduced ANS acuity as a consequence rather than a cause — related
- At all ages, children with developmental dyscalculia perform significantly lower than controls in magnitude comparison tasks using symbolic numbers — related
- Adults with dyslexia without dyscalculia show no deficit in nonsymbolic numerical magnitude processing
- Measures of the magnitude representation (ratio and distance effects) do not discriminate children with DD from matched controls — reports the opposite
- Anthropomorphic explanations appear in older children but less frequently, with only a minority of 14-year-olds' fuse explanations anthropomorphic — related
- Training effects on spatial language comprehension and verbal number skills tended to appear in younger rather than older children — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
dd-nonsymbolic-deficit-appears-later |
title |
DD children's deficit in non-symbolic number magnitude processing appears only in studies of older children (10 years and above), not younger ones |
description |
DD children's deficit in non-symbolic number magnitude processing appears only in studies of older children (10 years and above), not younger ones |
status |
review |
evidence_strength |
weak |
newest_evidence |
2011 |
source_checked |
2026-10-20 |
recheck_by |
2016 |
generated |
by process:wiki-ingest on 2026-10-17 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — noël-m-p-and-rousselle-l-2011 |
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