Excerpt from Children in Foster Homes, Vol. 16: A Study of Mental Development
The present study traces in some detail the mental growth Of a large group of children placed early in foster homes, relating the work not only to other studies in the Station but to the publications of Burks, Freeman, Jones and Leahy.
In general the IQ of a foster child during these preschool years is related not to the genetic constitution as derived from true mother and true father, but to the quality of the home in which he now lives.
Of one thing we can be reasonably sure: the Older idea that a gain or loss of as much as 20 IQ points must be exceedingly rare is definitely not valid for these young children. All measures of correlation and central tendency in this and allied Station studies demonstrate that, for young children subjected to demonstrably changed environments, substantial shifts are the rule rather than the exception. Nor can this be taken as a measure of the un reliability or futility of intelligence testing. Rather, to a significant extent (lying beyond the probable errors of measurement), such shifting indicates real losses and gains in the relative mental stand ing of the children involved.
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