Interprets high response consistency in imitation and semantic/syntactic substitutions as evidence of internalized control of grammar in severely retarded adolescents. Discusses teaching implications in terms of speaker ability to process basic semantic relationships. (Author/RL)

Motivational factors and unique characteristics of sign language systems are suggested as contributing to the ability of severely dysfunctional nonverbal children to make progress within a manual communication medium. (Author/EJS)

Describes a study that investigated the development of pattern recognition and pattern reversal in 20 deaf children aged six through eight and its relation to age of exposure to a gestural symbol system. (Author/DS)