Explored the roles of genes and environment in masculinity and femininity during pre- and early adolescence in 70 twins of 8-14 years. Results revealed significant genetic influences in all measures. Environmental influences were specific to each individual and not shared by members of the same twin pair. (RJC)

Reactions of 82 elementary school teachers and 107 college students were obtained to a tape of a child's voice labeled male or female, exhibiting stereotypically masculine or feminine verbal behavior. (Author/CM)

Children of 4 to 10 years of age were told about children whose sex was not specified and who had a masculine or feminine toy or characteristic. Results indicated that children first learn characteristics relevant to their own sex, and that older children's stereotypic judgments about gender are more extreme than those of younger children. (BC)

Assessed differences in masculinity, femininity, and sex role attitudes in adolescent girls and boys, and the relation of pubertal timing to intensification of those attitudes. Found that sex differences in masculinity and sex role attitudes increased with age. Pubertal timing was unrelated to masculinity, femininity, and sex role attitudes. (BC)