Piaget's research on the processes and products of cognitive and representational development in early childhood is employed to outline the bases of early language development. The processes of assimilation and accommodation, leading to horizontal decalage; empirical and reflective abstraction, resulting in schemas and schemes; as well as…

Native users of American Sign Language manipulated sentences in four ways: sign them at slow rate, parse them, make relatedness judgments of pairs of signs taken from each sentence, and recall the sentences. Hierarchical performance structures for each of the sentences were highly similar across tasks. (Author/RD)

The question of whether word meanings have internal structure identical in kind to the syntax of sentences is examined. Evidence is sought for the structural aspects of word meaning and the issue of whether judgements of similarity between words is based on meaning content or on meaning structure is raised. Four hypotheses were tested: (1)…

The question is addressed whether a child would develop a communication system if a conventional linguistic model is absent. Six congenitally deaf children, who were not exposed to Sign Language, were observed and videotaped at play in their homes at intervals of one to three months. The children ranged in age from 1 year, 5 months to 4 years, 1…