Six profoundly mentally retarded adults were trained to use 10 signs. Two Ss learned all signs with 100% accuracy without verbal prompting; four Ss learned seven to eight signs, varying with stimulus cue and setting. It was suggested that the four Ss may not have possessed adequate cognitive ability. (CL)

Twenty-four severely mentally retarded adolescents (with no uncorrected visual or hearing losses) were trained to use 16 manually signed English signs. Ss were randomly assiged to sign only, or sign plus speech conditions and performances were videotaped. Analysis of results revealed that all Ss learned some signs to criterion and all showed…

The study examined the effects of a pre-training general imitation experience on the learning of manual signs by 12 severely mentally retarded children (8-14 years old) and compared the effectiveness of three training methods--imitation, molding, or both. Ss were exposed to a pre-training experience consisting of either free play or general…

This study of eight severely mentally retarded nonverbal adults examined the form and function characteristics of intentional communication acts. Subjects who engaged in only contact gestures produced no protodeclarative type communication acts, whereas subjects who used distal as well as contact gestures produced some protodeclaratives.…

Experiences working with nonverbal severely and profoundly retarded and multiply handicapped children are discussed in this paper. Alternative communication systems are reviewed, including use of manual signs, pictures and symbols, photographs, realistic drawings, pictograms, and Bliss Symbols. A model for teaching basic understanding of…

A study involving five speaking and five non-speaking moderately/severely retarded adults revealed few differences in the ways either group revised or failed to revise their messages. Both groups were highly responsive to listeners' requests for clarification, although they tended to repeat their ambiguous messages rather than revising them. (CL)

Describes a study in which two nonspeech communication systems were evaluated with respect to their efficacy for use with profoundly retarded nonspeech children. Results show that 53 profoundly retarded children who have failed to acquire expressive linguistic skills can succeed with some alternative nonspeech symbol systems, especially with…

The study assessed effects of a transfer of stimulus control procedure on acquisition and cross-setting generalization of manual signs with four profoundly retarded young adults. Results showed that individuals acquired the trained signs and maintenance and generalization across settings and persons occurred but was highly variable between and…

Effects of high and low levels of manual sign translucency and referential concreteness on the manual sign learning of 40 moderately/severely mentally retarded adolescents were investigated. High levels of translucency were a significant facilitator while low levels inhibited learning. Concreteness did not significantly affect sign learning.…

Suggestions of writers such as A. Holland and M. Lahey and L. Bloom are examined regarding their appropriateness for visual-manual communication and are applied to approximately 50 signs most frequently taught to retarded and autistic persons to aid in lexicon planning. Additional signs are proposed for extending this basic list. (Author/DLS)

Symmetrical signs were acquired significantly faster than were asymmetrical signs, and touch signs were acquired significantly faster than were nontouch signs. Results of the acquisition of iconic v abstract signs were inconclusive. (Author)

Evaluation of a program which taught six severely mentally retarded individuals (ages 8-25) to sign interactively with each other found participants showed increased signing skills in a training play situation, generalized use of these skills in a second play situation, and maintained the trained skills over a 2 to 4 month period. (Author/DB)

Predictors of success in learning manual expressive communication were examined for 15 nonverbal profoundly retarded males (14-30 years old). (Author/CL)

Two studies explored linguistic development in sign and speech of 10 youth (ages 12-16) with severe intellectual impairments who used manual signs (Makaton vocabulary) for communication. Analysis of semantic relations, lexical development, and word order suggested the children's language had not developed beyond mean length of utterance stage 1.…

The effectiveness of sign language was compared with verbal language instruction with 12 nonverbal severely retarded students (4 to 9 years old). Ss received either speech training, sign language training, or instruction in an area other than communication. During the second year, 10 Ss received training from their parents. Results indicated no…