Describes code shifting study in communicative behavior of hearing child interacting with deaf child and mother, both of whom signed. Hearing child knew signing, but did not sign at home. Although communication change occurred, code shifting was influenced more by motivational variables and by hearing child's own flexibility with language than by…

Some 76 hearing children in prekindergarten classes, half receiving sign instruction and half not, were tested on English vocabulary acquisition. Children who received the sign instruction scored significantly higher on the Peabody Picture Vocabulary Test than children receiving sign instruction. (Contains 15 references.) (Author/LB)