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Direct linkViktorsson, Charlotte; Lindskog, Marcus; Li, Danyang; Tammimies, Kristiina; Taylor, Mark J.; Ronald, Angelica; Falck-Ytter, Terje – Developmental Science, 2023
The ability to perceive approximate numerosity is present in many animal species, and emerges early in human infants. Later in life, it is moderately heritable and associated with mathematical abilities, but the etiology of the Approximate Number System (ANS) and its degree of independence from other cognitive abilities in infancy is unknown.…
Descriptors: Infants, Numeracy, Genetics, Environmental Influences
Wong, Simpson W. L.; Chow, Bonnie Wing-Yin; Ho, Connie Suk-Han; Waye, Mary M. Y.; Bishop, Dorothy V. M. – Developmental Psychology, 2014
This twin study examined the relative contributions of genes and environment on 2nd language reading acquisition of Chinese-speaking children learning English. We examined whether specific skills-visual word recognition, receptive vocabulary, phonological awareness, phonological memory, and speech discrimination-in the 1st and 2nd languages have…
Descriptors: Twins, Chinese, English (Second Language), Second Language Learning
Fujisawa, Keiko K.; Wadsworth, Sally J.; Kakihana, Shinichiro; Olson, Richard K.; DeFries, John C.; Byrne, Brian; Ando, Juko – Learning and Individual Differences, 2013
This first Japanese twin study of early literacy development investigated the extent to which genetic and environmental factors influence individual differences in prereading skills in 238 pairs of twins at 42 months of age. Twin pairs were individually tested on measures of phonological awareness, "kana" letter name/sound knowledge,…
Descriptors: Twins, Preschool Children, Emergent Literacy, Early Reading
Dale, Philip S.; Harlaar, Nicole; Hayiou-Thomas, Marianna E.; Plomin, Robert – Journal of Speech, Language, and Hearing Research, 2010
Purpose: In the 2nd decade of life, language skills expand in both quantitative and qualitative ways. The etiology of these new skills and the relationships among them have been little explored. Method: Taking advantage of widespread access to inexpensive and fast Internet connections in the United Kingdom, we administered four Web-based measures…
Descriptors: Receptive Language, Language Skills, Twins, Preadolescents
Wheeler, Anne; Hatton, Deborah; Reichardt, Alison; Bailey, Don – Journal of Intellectual Disability Research, 2007
Background: The behaviours of 24 mothers of children with fragile X syndrome (FXS) with their affected children were examined during planned observations in their homes. The goal of this study was to describe concurrent maternal interactive behaviour and the factors that influence the type and frequency of these behaviours within this group.…
Descriptors: Mothers, Naturalistic Observation, Rating Scales, Receptive Language
DeThorne, Laura Segebart; Hart, Sara A.; Petrill, Stephen A.; Deater-Deckard, Kirby; Thompson, Lee Anne; Schatschneider, Chris; Davison, Megan Dunn – Journal of Speech, Language, and Hearing Research, 2006
Purpose: This study examined (a) the extent of genetic and environmental influences on children's articulation and language difficulties and (b) the phenotypic associations between such difficulties and direct assessments of reading-related skills during early school-age years. Method: Behavioral genetic analyses focused on parent-report data…
Descriptors: Organizations (Groups), Articulation (Speech), Environmental Influences, Twins
