Elementary school children were exposed to a series of modeled, tape-recorded sentences; those containing nongrammatical prepositional constructions were always vicariously rewarded, while the remaining, grammatically correct, background sentences were not. (Editor)

Uncertainty scores of the type proposed in this study, if suitably refined, may measure the developmental progression from stereotyped reliance on individual syntactic forms to flexible utilization of productive rules. (Authors/CB)

Syntactic rules with structural descriptions which apply on several linguistic levels are called global derivational constraints. (DD)

Study carried out as part of the research project Linguistics and Artificial Intelligence'', subsidized by the Council of the Arts of Canada and the University of Montreal; paper presented at the Second International Conference on Linguistics and Translation, October 4-7, 1972, Montreal, Canada. (RS)

Revised version of a paper read at the summer meeting of the Linguistic Society of America, Buffalo, New York, July 31, 1973. Preparation of the paper was supported by a National Science Foundation grant. (VM)

Research on which portions of this study are based was performed under a National Science Foundation Grant and a grant from the National Endowment for the Humanities. (VM)

Paper prepared under contract with the Defense Language Institute, English Language Branch, Lackland Air Force Base, Texas, and presented to the staff and faculty of the Institute in 1972. (RS)

Each speaker-hearer commands a language system that he uses unconsciously as he speaks and writes. Discovery of the rules underlying that system shows the futility of some accepted teaching practices and suggests other approaches. (Author)