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.…

This study investigated speaking rate and voice onset time (VOT) in speech produced during simultaneous communication (SC) by speakers with normal hearing. The somewhat enlarged voicing contrast during SC was consistent with previous findings regarding the influence of rate changes on the temporal fine structure of speech and voicing contrast…

This study examined keyword signing (KWS), a communication approach used with nonspeaking individuals. Acoustic measures and judgments of 20 adult listeners were used to evaluate KWS and Spoken-Only narratives. KWS narratives were produced with a slower articulation rate, because of increased pause and speech segment duration and increased pause…

Differential effects of parental deafness and early exposure to manual communication were not observed in the cognitive and communication performance of the 38 experimental subjects. Furthermore, the Delayed sign language group performed significantly better than the early American Sign Language group on tests of speech perception and speech…

A test of morpheme-based concepts was administered to 67 deaf children (ages 5-11 years) who were exposed to Seeing Essential English (SEE--a visual English sign system). (Author)

Experienced deaf-blind users (N=10) of sign language tested their ability to receive signed messages including isolated signs and sentences. A set of 122 isolated signs was received with an average accuracy of 87%. Signed sentence reception accuracy ranged from 60-85%, with errors accounted for primarily by deletions and phonological or…