“…Nevertheless, among these research studies, conflicting findings are as common as continuity in research themes, and hypotheses are uncommon. For example, studies have demonstrated that severely retarded, autistic children respond well to training in the use of symbols and pictures (Miranda and Schuler, 1988;Riechle and Brown, 1986) while others show difficulty with manual sign training (Murphy et al, 1977;Lancioni, 1983;Kiernan and Jones, 1985). On the contrary, other studies conclude that the use of simultaneous communication (sign and speech together) or sign language training can improve the communication skills, either speech or sign, of low-functioning, autistic children (Bonvillian, Nelson, and Rhyne, 1981;Brinton, Fujiki, and Erikson, 1985;Van Wagenen et al, 1985).…”