Differences between formal constraints on a generative grammar and concepts of efficiency in transforming sentences provide different expectations regarding performance measures if the grammar is taken as a psychologically real model. To contrast these views, subjects were given sentences varying in voice, mood, and modality and asked to transform…

A reaction-time experiment measured the time that subjects needed to read and comprehend a series of sentences, the syntactic form of which was systematically varied. The focus was on the effect of syntactic structure on processing time, reflected in reaction time in a neutral context, and the effect of prior context on time needed to process a…