ABSTRACT
Background and Objectives@#Currently limited information is available on speech stimuli processingat the subcortical level in the recipients of cochlear implant (CI). Speech processing inthe brainstem level is measured using speech-auditory brainstem response (S-ABR). The purposeof the present study was to measure the S-ABR components in the sound-field presentationin CI recipients, and compare with normal hearing (NH) children. Subjects and Methods:In this descriptive-analytical study, participants were divided in two groups: patients withCIs; and NH group. The CI group consisted of 20 prelingual hearing impairment children (meanage=8.90 ± 0.79 years), with ipsilateral CIs (right side). The control group consisted of 20healthy NH children, with comparable age and sex distribution. The S-ABR was evoked bythe 40-ms synthesized /da/ syllable stimulus that was indicated in the sound-field presentation. @*Results@#Sound-field S-ABR measured in the CI recipients indicated statistically significantdelayed latencies, than in the NH group. In addition, these results demonstrated thatthe frequency following response peak amplitude was significantly higher in CI recipients,than in the NH counterparts (p<0.05). Finally, the neural phase locking were significantlylower in CI recipients (p<0.05). Conclusions: The findings of sound-field S-ABR demonstratedthat CI recipients have neural encoding deficits in temporal and spectral domains atthe brainstem level; therefore, the sound-field S-ABR can be considered an efficient clinicalprocedure to assess the speech process in CI recipients. J Audiol Otol 2020;24(2):71-78