A Model of Cognitive Development
The fact that the intelligence quotient in either of its common forms is an inadequate representation of cognitive development has been widely recognized for many decades. Most longitudinal studies over wide age ranges indicate that with at least a considerable proportion of subjects there are systematic trends in IQ changes. One of the recent studies, McCall (1973), classified subjects in terms of types of changes and was able to relate type of change to type of child raising practice in a number of cases. Such studies indicate that a one parameter representation of cognitive development is inadequate.
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