title: Math fluency is etiologically distinct from untimed math performance, decoding fluency, and untimed reading performance: evidence from a twin study.
abstract: The authors examined whether math fluency was independent from untimed math and from reading using 314 pairs of school-aged twins drawn from the Western Reserve Reading and Math Projects. Twins were assessed through a 90-min home visit at approximately age 10 and were reassessed in their homes approximately 1 year later. Results suggested that the shared environment and genetics influenced the covariance among math fluency, untimed math measures, and reading measures. However, roughly two thirds of the variance in math fluency was independent from untimed math measures and reading, including reading fluency. The majority of this independent variance was the result of genetic factors that were longitudinally stable across two measurement occasions. These results suggest that math fluency, although related to other math measures, may also be a genetically distinct dimension of mathematics performance.
authors: Ohio State University, Columbus, OH 43210, USA. petrill.2@osu.edu
authors: Stephen
authors: S
authors: Petrill
authors: Jessica
authors: J
authors: Logan
authors: Sara
authors: S
authors: Hart
authors: Pamela
authors: P
authors: Vincent
authors: Lee
authors: L
authors: Thompson
authors: Yulia
authors: Y
authors: Kovas
authors: Robert
authors: R
authors: Plomin
mesh_terms: D000124:Achievement; D001076:Aptitude; D002648:Child; D032882:Comprehension; D004200:Diseases in Twins / Q000175:diagnosis* / Q000235:genetics* / Q000523:psychology; D060705:Dyscalculia / Q000175:diagnosis* / Q000235:genetics* / Q000523:psychology; D004410:Dyslexia / Q000175:diagnosis* / Q000235:genetics* / Q000523:psychology; D005260:Female; D059647:Gene-Environment Interaction; D005799:Genes, Dominant; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008957:Models, Genetic; D010641:Phenotype; D011340:Problem Solving; D011930:Reaction Time; D011932:Reading; D014429:Twins, Dizygotic / Q000235:genetics / Q000523:psychology; D014430:Twins, Monozygotic / Q000235:genetics / Q000523:psychology