This paper represents an effort to explain the language development of the child within the analytic frame of overtly observable data and without recourse either to mathematical models or to postulating hypothetical underlying forms. From longitudinal studies of two-year old children conducted by the author as well as from similar data reported in…

This investigation studied the development of the form and function of negative sentences, and how it relates to the input on negation that children receive from their parents. The data came from three children: two from a previous study (Bellugi) and one the son of the investigators. A detailed analysis was carried out of the syntactic form and…