Fourteen deaf elementary children (eight from total communication and six from oral classes) and seven non-hearing-impaired peers were given tasks designed to elicit spontaneous language. Results favored hearing children on all measures. When comparing the two deaf groups, few differences emerged in measures of verbal output and communicativeness.…

This study of four moderately to severely aphasic subjects found that success in manual sign training programs is related to severity of aphasia, that aphasic subjects' propositional use of manual signs rarely follows simple acquisition, and that generalization to untrained stimuli or environments does not occur without additional training.…