The Age of Walking and Talking in Relation to General Intelligence

The Development of Language in Twins: I. A Comparison of Twins and Single Children

“…In agreement with the findings of McCarthy, Nice (15), Gale (6), Mead (14), Terman (20), and Doran (4) the Kuhlman-Binet test (the test used for the singletons) tended to score too high at the early ages. The singletons then appear to have been a group slightly superior even though they were so carefully selected.…”

Language development.

“…Nice (155) reports a superiority of girls in extent of vocabulary; Terman (216) gives an earlier age for the appearance of short sentences among gifted girls than among gifted boys; Mead (138) found that feebleminded boys began to talk later than feebleminded girls. Doran (57), on the basis of an elaborate survey of the literature, states that girls have larger vocabularies than boys of the same age, but that the difference becomes smaller among older children.…”

The psychology of sex.

“…Mead (54) gives a small but reliable set of statistics supporting the popular opinion that girls learn to walk and talk earlier than boys. Starch (72) measured the handwriting of the entire school system of Madison, Wisconsin, and found the girls superior to the boys in speed, legibility, and form.…”