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Flieller, Andre – Developmental Psychology, 1999
Administered five Piagetian tests to 180 adolescents for comparison to similar samples from 1967 and 1972. Found that today's adolescents exhibited higher levels of cognitive development than did previous cohorts. Gain varied across tasks, being very large for combinatory thought but mixed for conservation. This acceleration of cognitive…
Descriptors: Adolescents, Cognitive Development, Cohort Analysis, Cross Sectional Studies