An argument is presented showing that the postulation of psychological capabilities that are jointly necessary to and specific to other capabilities involves strong theoretical commitments that have not generally been recognized. Examples are drawn from language development and evolution. (SS)

Focuses on some apparently evolved features of human adolescence and their possible functions, including the pubertal growth spurt, sexual size dimorphism and bimaturism, the greater aggressiveness of males, heightened concern with one's social standing and the factors affecting it, intergenerational friction, same-sex aggregations and solidarity,…