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Peer reviewedBraungart, Julia M.; And Others – Developmental Psychology, 1992
The Infant Behavior Record (IBR) assessed the temperament of 95 nonadoptive and 80 adoptive sibling pairs at 1 and 2 years of age. Data from this and an earlier similar study of identical and fraternal twins yielded evidence for genetic influence for IBR factors of extraversion, activity, and task orientation. (BC)
Descriptors: Adopted Children, Environmental Influences, Extraversion Introversion, Genetics
