Offers an organizational perspective designed to illuminate processes of symbolic development in both normal and abnormal populations. Focuses on the symbolic system of Down Syndrome children. Data support the claim that the symbolic system of these children is intact. (RWB)

This paper offers some ideas on the types of behavior that can be considered precursors to language and that also lay the foundations for logic, mathematics, physics, etc. The paper posits the problem of whether a theory of language must be formulated before one can formulate a theory of language acquisition, or whether the reverse is true. The…

Approximately 1,500 published and unpublished books and articles are listed in this bibliography on the broad area of observational learning in children which includes modeling, imitation, and vicarious conditioning. The majority of sources listed are dated from the 1960's and 1970's although some date as far back as the 1930's. Research in such…