Sara A. Hart|Stephen A. Petrill|Laura S. DeThorne|Kirby Deater?Deckard|Lee A. Thompson|Christopher Schatschneider|Laurie E. Cutting
Environmental influences on the longitudinal covariance of expressive vocabulary: measuring the home literacy environment in a genetically sensitive design
The Ohio State University|The Ohio State University|University of Illinois Urbana-Champaign|Virginia Tech|Case Western Reserve University|Florida State University|Kennedy Krieger Institute|Johns Hopkins University
background despite wellreplicated relationship home literacy environment expressive vocabulary studies examined extent home literacy environment associated development early vocabulary ability context genetic influences study examined influence home literacy environment longitudinal covariance expressive vocabulary within genetically sensitive design methods participants drawn western reserve reading project longitudinal twin project 314 twin pairs based ohio twins assessed via three annual home visits early elementary school expressive vocabulary measured via boston naming test bnt home literacy environment hle assessed using mothers report results heritability bnt moderate significant measurement occasion h 2 2949 estimates shared environment c 2 2739 hle accounted 610 total variance year vocabulary assessment furthermore 79 total variance stability time bnt accounted covariance home literacy environment conclusions results indicate aspects home literacy environment reported mothers account shared environmental variance associated expressive vocabulary school aged children