Hart and Risley’s Three Key Findings:
May 19, 2010 · The children were given cognitive tests before their adoption and again between the ages of eleven and eighteen. Overall, the children showed striking gains in IQ test scores from early childhood to adolescence, from a mean score of 77 to 91 (14 points or almost one standard deviation on a test with a mean of 100 and a standard deviation of 15). ................
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