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Ronald, Angelica; Edelson, Lisa R.; Asherson, Philip; Saudino, Kimberly J. – Journal of Abnormal Child Psychology, 2010
Behaviors characteristic of autism and ADHD emerge in early childhood, yet research investigating their comorbidity has focused on older children. This study aimed to explore the nature of the relationship between autistic-like traits and ADHD behaviors in a community sample of 2-year-olds. Twins from the Boston University Twin Project (N = 312…
Descriptors: Siblings, Attention Deficit Hyperactivity Disorder, Children, Genetics

Knopik, Valerie S.; Defries, John C. – Intelligence, 1998
To study whether individual differences in general cognitive ability differ in males and females, full-scale IQ data from 426 child twin pairs were fitted to a structural equation model of sex limitation. Individual differences in general cognitive ability appear to be substantially due to common genetic influences in males and females. (SLD)
Descriptors: Biological Influences, Cognitive Ability, Genetics, Individual Differences

Cardon, Lon R.; Fulker, David W. – Intelligence, 1991
Sources of continuity among nine measures of infant cognitive processing and later childhood intelligence quotient were examined through developmental structural equation models applied to a sample of 208 twin pairs measured from 7 to 36 months. Skills assessed appear related to general cognitive ability in a relatively unstable manner. (SLD)
Descriptors: Child Development, Cognitive Ability, Cognitive Processes, Cognitive Tests