Nonword repetition with spectrally reduced speech: some developmental and clinical findings from pediatric cochlear implantation

Abstract

Nonword repetition skills were examined in 24 pediatric cochlear implant (CI) users and 18 normal-hearing (NH) adult listeners listening through a CI simulator. Two separate groups of NH adult listeners assigned accuracy ratings to the nonword responses of the pediatric CI users and the NH adult speakers. Overall, the nonword repetitions of children using CIs were rated as more accurate than the nonword repetitions of the adults. The nonword repetition accuracy ratings from both groups of subjects were correlated with open- and closed-set word recognition scores and forward digit spans. Only the perceptual accuracy scores from pediatric CI users were correlated with measures of speech production accuracy. These results suggest that although the pediatric CI users had more experience and success in perceiving speech under degraded auditory conditions, developmental differences in their memory skills prevent them from performing as well on working memory tasks as mature listeners.

Figure 1

Performance on closed- and open-set speech perception tests by pediatric CI users and NH adults listening to an acoustic simulation of a CI.

Figure 2

Forward and backward digit span scores of pediatric CI users and NH adults listening to an acoustic simulation of a CI.

Figure 3

Mean perceptual accuracy ratings assigned to pediatric CI users and NH adults when repeating nonwords with 2, 3, 4, and 5 syllables.