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Direct linkMimeau, Catherine; Dionne, Ginette; Feng, Bei; Brendgen, Mara; Vitaro, Frank; Tremblay, Richard E.; Boivin, Michel – Language Learning and Development, 2018
This twin study examined the genetic and environmental etiology of vocabulary, syntax, and their association in first graders. French-speaking same-sex twins (n = 555) completed two vocabulary tests, and two scores of syntax were calculated from their spontaneous speech at 7 years of age. Multivariate latent factor genetic analyses showed that…
Descriptors: Genetics, Etiology, Vocabulary, Syntax
Rice, Mabel L.; Zubrick, Stephen R.; Taylor, Catherine L.; Hoffman, Lesa; Gayán, Javier – Journal of Speech, Language, and Hearing Research, 2018
Purpose: This study investigates the heritability of language, speech, and nonverbal cognitive development of twins at 4 and 6 years of age. Possible confounding effects of twinning and zygosity, evident at 2 years, were investigated among other possible predictors of outcomes. Method: The population-based twin sample included 627 twin pairs and 1…
Descriptors: Longitudinal Studies, Genetics, Twins, Cognitive Development
Erbeli, Florina; Hart, Sara A.; Wagner, Richard K.; Taylor, Jeanette – Scientific Studies of Reading, 2018
A fairly recent definition of reading disability (RD) is that in the form of a hybrid model. The model views RD as a latent construct that is manifested through various observable unexpected impairments in reading-related skills and through inadequate response to intervention. The current report evaluated this new conceptualization of RD from an…
Descriptors: Etiology, Reading Difficulties, Reading Programs, Response to Intervention
Tucker-Drob, Elliot M.; Reynolds, Chandra A.; Finkel, Deborah; Pedersen, Nancy L. – Developmental Psychology, 2014
Aging-related declines occur in many different domains of cognitive function during middle and late adulthood. However, whether a global dimension underlies individual differences in changes in different domains of cognition and whether global genetic influences on cognitive changes exist is less clear. We addressed these issues by applying…
Descriptors: Genetics, Environmental Influences, Aging (Individuals), Cognitive Ability
