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Infant Communicative Development: Evidence from Adoptive and Biological Families for Genetic and Environmental Influences on Rate Differences.
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Hardy-Brown, Karen; Plomin, Robert – Developmental Psychology, 1985
Parent/infant relationships were investigated among 50 biologically related families selected to provide a control group for an adoption study of rate differences in communicative development in infancy. In addition, a path analysis of genetic and environmental influences on communicative development is presented incorporating the overall sample.…
Descriptors: Adopted Children, Biological Parents, Child Development, Communication (Thought Transfer)
Birthweight-Discordance and Differences in Early Parenting Relate to Monozygotic Twin Differences in Behaviour Problems and Academic Achievement at Age 7
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Asbury, Kathryn; Dunn, Judith F.; Plomin, Robert – Developmental Science, 2006
This longitudinal monozygotic (MZ) twin differences study explored associations between birthweight and early family environment and teacher-rated behaviour problems and academic achievement at age 7. MZ differences in anxiety, hyperactivity, conduct problems, peer problems and academic achievement correlated significantly with MZ differences in…
Descriptors: Behavior Problems, Academic Achievement, Hyperactivity, Effect Size
A Behavioural Genomic Analysis of DNA Markers Associated with General Cognitive Ability in 7-Year-Olds
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Harlaar, Nicole; Butcher, Lee M.; Meaburn, Emma; Sham, Pak; Craig, Ian W.; Plomin, Robert – Journal of Child Psychology and Psychiatry, 2005
Background: Five DNA markers (single-nucleotide polymorphisms, SNPs) have recently been found to be associated with general cognitive ability "g") in a sample of 7414 7-year-old twins. These children have also been studied at 2, 3, 4, and 7 years of age on measures of cognitive and language development and behaviour problems; family environment…
Descriptors: Discipline, Effect Size, Family Environment, Nonverbal Ability