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The Colorado Adoption Project.
Peer reviewed Peer reviewed
Plomin, Robert; DeFries, J. C. – Child Development, 1983
Provides an overview of a longitudinal, prospective, multivariate adoption study of behavioral development and discusses the results of analyses of cognitive measures and environmental assessments as examples of the types of information that can emerge from a design of this sort. (Author/RH)
Descriptors: Adoption, Behavior Development, Biological Influences, Children
A Parent-Offspring Adoption Study of Cognitive Abilities in Early Childhood.
Peer reviewed Peer reviewed
Plomin, Robert; DeFries, J. C. – Intelligence, 1985
The present study is a behavioral genetic analysis of specific cognitive abilities in early childhood. Parent-offspring data for adopted children and nonadopted children in the Colorado Adoption Project were used. Significant correlations were found between biological mothers' IQ and the IQ of offspring, but not for specific cognitive abilities.…
Descriptors: Adopted Children, Analysis of Variance, Biological Parents, Cognitive Ability
Parent-Offspring Resemblance for Cognitive Abilities in the Colorado Adoption Project: Biological, Adoptive, and Control Parents and One-Year-Old Children.
Peer reviewed Peer reviewed
DeFries, J. C.; And Others – Intelligence, 1981
Results from the Colorado Adoption Project, a longitudinal study initiated in 1975, are reported. The cognitive ability of parents and measures of one-year olds' mental development were significantly correlated for all three parent/child comparisons. Caldwell's HOME Responsibility measure was correlated with infant intelligence in adoptive and…
Descriptors: Adopted Children, Adults, Cognitive Measurement, Correlation