Differences in Full Scale WISC IQ for 300 black and 300 white southern children from families of low income and aged 6 through 15 yr., who were referred for psychometric assessment, are reported, and three distinct trends observed. The difference between IQs of these blacks and whites tended to increase from Ages 6 through 15 yr. The black children tended generally to decrease in IQ from Ages 6 through 15, while the white children tended to increase in IQ from Ages 6 to 12 and then decrease through Age 15.
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