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Direct linkToseeb, Umar; Oginni, Olakunle Ayokunmi; Dale, Philip S. – Journal of Learning Disabilities, 2022
There is considerable variability in the extent to which young people with developmental language disorder (DLD) experience mental health difficulties. What drives these individual differences remains unclear. In the current article, data from the Twin Early Development Study were used to investigate the genetic and environmental influences on…
Descriptors: Language Impairments, Correlation, Psychopathology, Mental Health
Tosto, Maria G.; Hayiou-Thomas, Marianna E.; Harlaar, Nicole; Prom-Wormley, Elizabeth; Dale, Philip S.; Plomin, Robert – Developmental Psychology, 2017
This study examines the genetic and environmental etiology underlying the development of oral language and reading skills, and the relationship between them, over a long period of developmental time spanning middle childhood and adolescence. It focuses particularly on the differential relationship between language and two different aspects of…
Descriptors: Twins, Genetics, Reading Fluency, Structural Equation Models
Harlaar, Nicole; Trzaskowski, Maciej; Dale, Philip S.; Plomin, Robert – Child Development, 2014
The genetic effects on individual differences in reading development were examined using genome-wide complex trait analysis (GCTA) in a twin sample. In unrelated individuals (one twin per pair, n = 2,942), the GCTA-based heritability of reading fluency was ~20%-29% at ages 7 and 12. GCTA bivariate results showed that the phenotypic stability of…
Descriptors: Reading Skills, Twins, Genetics, Individual Differences
Haworth, Claire M. A.; Kovas, Yulia; Harlaar, Nicole; Hayiou-Thomas, Marianna E.; Petrill, Stephen A.; Dale, Philip S.; Plomin, Robert – Journal of Child Psychology and Psychiatry, 2009
Background: Our previous investigation found that the same genes influence poor reading and mathematics performance in 10-year-olds. Here we assess whether this finding extends to language and general cognitive disabilities, as well as replicating the earlier finding for reading and mathematics in an older and larger sample. Methods: Using a…
Descriptors: Twins, Children, Learning Disabilities, Genetics
Harlaar, Nicole; Hayiou-Thomas, Marianna E.; Dale, Philip S.; Plomin, Robert – Journal of Speech, Language, and Hearing Research, 2008
Purpose: Language acquisition is predictive of successful reading development, but the nature of this link is poorly understood. Method: A sample of 7,179 twin pairs was assessed on parent-report measures of syntax and vocabulary at ages 2, 3, and 4 years and on teacher assessments of reading achievement (RA) at ages 7, 9, and 10 years. These…
Descriptors: Language Acquisition, Twins, Reading Achievement, Language Aptitude
Hayiou-Thomas, Marianna E.; Kovas, Yulia; Harlaar, Nicole; Plomin, Robert; Bishop, Dorothy V. M.; Dale, Philip S. – Journal of Child Language, 2006
Multivariate genetic analysis was used to examine the genetic and environmental aetiology of the interrelationships of diverse linguistic skills. This study used data from a large sample of 4 1/2-year-old twins who were tested on measures assessing articulation, phonology, grammar, vocabulary, and verbal memory. Phenotypic analysis suggested two…
Descriptors: Twins, Phonology, Genetics, Environmental Influences
