The frequency with which a child's parents use a given linguistic form has been considered influential in language development. This hypothesis has been challenged, however, notably by Ervin (1964) and Brown (1973). The frequency hypothesis makes the assumptions that: (1) children are not selective in what they attend to, (2) they listen to most…

On the basis of experimental data, the author makes the following observations: (1) the basic encoding processes in speech, the schemas of order, first produce elementary underlying sentences; (2) underlying sentence structure is the controlling step in the organization of speech; (3) underlying sentence structure plays a central role in…