Until the 1970s, there were few signs of change in the historic difference of one standard deviation between average ability or achievement test scores of black and white students. From 1970 to the mid-to-late 1980s, there was a substantial convergence of the average achievement test scores of blacks and whites. From the mid-to-late 1980s to 1992,…

Genetic influence was estimated on Wechsler Intelligence Scale for Children subtests from inbreeding depression scores calculated on cousin marriages in Japan (n=1,854 children) and correlated with American Black-White racial differences. The genetic contribution of racial differences in cognitive performance may be more robust than was previously…

The results of a modified version of the Goodenough-Harris Drawing Test are presented in relation to selected demographic and socioeconomic factors as they affect youths aged 12-17 years in the noninstitutionalized population of the United States. Findings are based on data gathered on a sample of 6,768 adolescents who participated in the Health…