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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
