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Peer reviewedKent, Jaylene; Plomin, Robert – Intelligence, 1987
A telephone test battery to assess verbal, spatial, and memory ability and perceptual speed in adolescents was developed. Test materials were mailed to 212 adolescents (members of 54 adoptive and 52 nonadoptive sibling pairs). Results show that telephone testing can be satisfactorily used to assess specific cognitive abilities with less anxiety…
Descriptors: Adolescents, Cognitive Ability, Perception, Spatial Ability
Peer reviewedFinkel, Deborah; Pedersen, Nancy L.; Plomin, Robert; McClearn, Gerald E. – Developmental Psychology, 1998
Collected data on twins' performance on 13 cognitive variables measured three times at three-year intervals. Twins were monozygotic or dizygotic pairs reared together or apart and were in six cohorts ranging in age from 41 through 84 years. Found stable mean cognitive performance across time on eight measures for the younger cohorts, and…
Descriptors: Age Differences, Aging (Individuals), Cognitive Ability, Foreign Countries
