Reviews developmental literature on cognitive gender differences; and compares past and present trends in gender differences, by age, from standardizations of the Wechsler Intelligence Scales and the California Achievement Tests. Decreases are found in gender differences for adolescents but not for adults. Implications are discussed. (SLD)

Raven's Progressive Matrices and the Simpson Adult Vocabulary Scale were administered to 400 Australian hospitalized adults without psychiatric or neurological impairment in 4 age groups from 30 to 69 years. Compared to pre-1964 data, the subjects did not show gains in intelligence quotient as did younger age groups. (SLD)

A written intelligence test with verbal, reasoning, and spatial subscales was administered to two comparable national samples of 1,000 thirteen-year olds in Sweden, tested in 1961 and in 1966. The increases were greater for girls than for boys, and the changes occurred simultaneously with several changes in social and educational conditions. To…