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| Intelligence | 3 |
Author
| DeFries, J. C. | 3 |
| Plomin, Robert | 2 |
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| Journal Articles | 3 |
| Reports - Research | 2 |
| Information Analyses | 1 |
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| Bayley Scales of Infant… | 1 |
| Home Observation for… | 1 |
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Peer reviewedPlomin, 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
Peer reviewedDeFries, 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
Peer reviewedPlomin, Robert; DeFries, J. C. – Intelligence, 1980
Extensive data on twins, nontwin siblings, siblings separated by adoption, and parent-child similarity indicate that the heritability of intelligence is closer to .50 than to .70. Differences could be due to environmental or genetic changes in the population, or to methodology. (Author/CP)
Descriptors: Adopted Children, Correlation, Environmental Influences, Family Influence
