Abstract
Normals and retardates from 5–10 in MA (with IQ controlled across MA levels in each group) were tested for additive composition of classes using different colored wooden beads. Additive composition was positively related to MA level within both IQ groups. Age placement for additive composition was MA 9 for normals, rather than 7–8 as found by Piaget. Age placement of MA 8 for retardates, however, corresponded to Piaget’s results. No transitional stage between additive and nonadditive composition of classes, reported by Piaget, was found in the present study.
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References
ELKIND, D. The development of the additive composition of classes in the child: Piaget replication study III. J. genet. Psychol., 1961, 99, 51–57.
PIAGET, J. The child’s conception of number. London: Kegan Paul, 1952.
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1. This study done under the support of NICHHD Grant No. 00870, Bureau of Child Research, University of Kansas.
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McManis, D.L. Additive composition by normal and retarded children of matched MA. Psychon Sci 11, 207 (1968). https://doi.org/10.3758/BF03327661
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DOI: https://doi.org/10.3758/BF03327661