Twins: Concordance for Piagetian-Equivalent Items Derived from the Bayley Mental Test.

Matheny, Adam P., Jr.

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Peer reviewed

ERIC Number: EJ116431

Record Type: Journal

Publication Date: 1975

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Twins: Concordance for Piagetian-Equivalent Items Derived from the Bayley Mental Test

Matheny, Adam P., Jr.

Developmental Psychology, 11, 2, 224-227, Mar 75

Analyzed 20 test items for evidence of concordance for samples that included at least 120 pairs of identical twins and 85 pairs of same-sex fraternal twins at ages 3, 6, 9 and 12 months. Also computed within-pair correlations for the total number of Piagetian-equivalent items passed. (Author/SDH)

Descriptors: Age Differences, Biological Influences, Cognitive Development, Developmental Psychology, Infants, Nature Nurture Controversy, Psychomotor Skills, Twins

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