A common genetic factor influences mathematics, word decoding, and reading comprehension, with substantial genetic overlap across all three domains¶
Claim · All claims
Evidence · 1 study · associationalr3·q3
Currency · newest study 2012 · not yet checked against its sources · not reviewed by a person
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.
q3 i? Genetic factors common to all three domains accounted for all genetic variance in mathematics, 25% of genetic variance in word decoding, and 56% in reading comprehension. → Harlaar 2012
Evidence¶
Harlaar 2012¶
Harlaar, N., Kovas, Y., Dale, P. S., Petrill, S. A., & Plomin, R. (2012). Mathematics is differentially related to reading comprehension and word decoding: Evidence from a genetically-sensitive design. Journal of Educational Psychology, 104(3). https://doi.org/10.1037/a0027646
q3 · i? · associational · r3
Cholesky decomposition of latent factors in the age-12 twin sample. The common genetic factor A1 accounted for "all of the genetic variance in mathematics (.60)", 25% of word decoding genetic variance, and 56% of reading comprehension genetic variance.
"Genetic factors common to all three factors (represented by A1) accounted for all of the genetic variance in mathematics (.60), 25% of the genetic variance in word decoding (.21/.83 = .25, where .83 is the total genetic variance in word decoding), and 56% of the genetic variance in reading comprehension"
Discussion¶
Related Claims¶
- Reading comprehension retains genetic and nonshared environmental influences independent of both mathematics and word decoding — related
- Genetic influences drive the phenotypic correlations between cognitive skills and reading components — a broader claim this one bears on
- Word decoding is significantly more heritable (.84) than mathematics (.60) and reading comprehension (.64) at age 12 — related
- Cognitive and reading skills share large amounts of genetic variance within domains — a broader claim this one bears on
- The genetic correlation between mathematics and reading comprehension (.76) is significantly higher than between mathematics and word decoding (.50) — related
- At age 12, mathematics is more strongly correlated with reading comprehension than with word decoding at the phenotypic latent-factor level — related
- Shared environmental influences on mathematics, word decoding, and reading comprehension are nearly identical across the three domains — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
common-genetic-factor-across-math-and-reading-domains |
title |
A common genetic factor influences mathematics, word decoding, and reading comprehension, with substantial genetic overlap across all three domains |
description |
A common genetic factor influences mathematics, word decoding, and reading comprehension, with substantial genetic overlap across all three domains |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2012 |
generated |
by process:wiki-ingest on 2026-10-25 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — harlaar-2012 |
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