Studied across a 16-month period, young children of deaf parents showed accelerated early language development, on the average producing their first recognizable sign at 8.5 months, their tenth sign at 13.2 months, and their first sign combination at 17.0 months. Findings are inconsistent with previously reported patterns of synchrony between…

Examined the effect over time of the use of sign language in a two-year period, including preschool and ending with kindergarten, on hearing children's language development. Found vocabulary gains, no evidence of memory decay over time, and positive evidence for inclusion of sign language instruction in early childhood education. (SD)