The uniform principle assuming that comprehension precedes production in language acquisition was examined using Down's Syndrome children taught to comprehend singular/plural nouns and produce such forms for another noun. Three subjects reached criterion production first and one reached comprehension first, suggesting the modes can develop…

Two experiments examined the comprehension of singly and multiply negated sentences. Difficulty of comprehension was measured by the speed and accuracy with which subjects judged the semantic reasonableness of sentences. Marked and negatively prefixed adjectives were a particular focus of the study. (Author/RM)

An experiment is described that involved presenting sentences to the subject for study and then testing single words for recognition (the subject had to decide whether the test word was in one of the study sentences). A large priming effect was obtained. (Author/RM)

Investigated children's understanding of meaning of the cognitive verb "know" (as defined by an abstractness and conceptual difficulty hierarchy). Found that knowledge increased with development, and low levels of meaning were mastered before high levels, and more rapidly. Understanding in audio-taped stories was more difficult than in video-taped…