English-language skills were evaluated in two groups of profoundly hea
ring-impaired children with the Reynell Developmental Language Scales,
Revised. The first group consisted of 89 deaf children who had not re
ceived cochlear implants. The second group consisted of 23 children we
aring Nucleus multichannel cochlear implants. The subjects without imp
lants provided cross-sectional language data used to estimate the amou
nt of language gains expected on the basis of maturation. The Reynell
data from the group without implants were subjected to a regression by
age. On the basis of this analysis, deaf children were predicted to m
ake half or less of the language gains of their peers with normal hear
ing, Predicted language scores were then generated for the subjects wi
th implants by using the children's preimplant Reynell Developmental L
anguage Scale scores, The predicted scores were then compared with act
ual scores achieved by the subjects with implants 6 and 12 months afte
r implantation. Twelve months after implantation, the subjects demonst
rated gains in receptive and expressive language skills that exceeded
by 7 months the predictions made on the basis of maturation alone. Mor
eover, the average language-development rate of the subjects with impl
ants in the first year of device use was equivalent to that of childre
n with normal hearing. These effects were observed for children with i
mplants using both the oral and total-communication methods.