Examined parental speech data demonstrating that linguistic input to children does not contain sufficient information to support unaided learning of the pronoun "one." Examined 18-month-olds' interpretation of sentences with a "one" substitution. Found that 18-month-olds have command of the syntax of "one." Because…

Human infants are predisposed to organize their experience in terms of certain concepts (natural) and not others (unnatural). Three formal, necessary conditions on the naturalness of concepts are offered. The conditions attempt to link the problem of naturalness to principled distinctions between sense vs nonsense, simplicity vs complexity, and…