ERIC Number: EJ696535
Record Type: Journal
Publication Date: 2004-Aug
Reference Count: N/A
Genetic, Environmental, and Gender Effects on Individual Differences in Toddler Expressive Language
Van Hulle, Carol A.; Goldsmith, H.H.; Lemery, Kathryn S.
Journal of Speech, Language, and Hearing Research, v47 n4 p904 Aug 2004
In this article, the authors examined the genetic and environmental factors influencing expressive language development in a sample of 386 toddler twin pairs participating in the Wisconsin Twin Project. Expressive language was assessed using 2 measures from the MacArthur Communicative Development Inventories-Short Form: Total Vocabulary and Two-Word Combination Use (L. Fenson et al., 2000). A sex-limitation structural equation model estimated the contribution of genetics, shared environment, and nonshared environment to individual variation. For vocabulary, heritability was higher for boys than for girls (20% vs. 8%). For word combination use, heritability was higher for girls (28% vs. 10%). However, the majority of individual variation in both boys and girls could be attributed to shared environment (54%-78%).
Descriptors: Toddlers, Females, Twins, Males, Language Acquisition, Gender Differences, Genetics, Expressive Language, Nature Nurture Controversy
American Speech-Language-Hearing Association, 10801 Rockville Pike, Rockville, MD 20852. Tel: 301-897-5700, ext. 4164; Fax: 301-897-7348
Publication Type: Journal Articles; Reports - Evaluative
Education Level: Early Childhood Education
Authoring Institution: N/A
Identifiers - Location: Wisconsin