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J Audiol Otol. 2018 Jan;22(1):28-38. English. Original Article. https://doi.org/10.7874/jao.2017.00178
Chang SA , Won JH , Kim H , Oh SH , Tyler RS , Cho CH .
Department of Otolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, Korea.
Department of Audiology and Speech Pathology, University of Tennessee Health Science Center, Knoxville, TN, USA. jhwon15@gmail.com
Graduate Program of Speech and Language Pathology, Department and Research Institute of Rehabilitation Medicine, Yonsei University College of Medicine, Seoul, Korea.
Department of Otolaryngology-Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, IA, USA.
Department of Otolaryngology-Head and Neck Surgery, Gachon University Gil Medical Center, Incheon, Korea.
Abstract

Background and Objectives

It is important to understand the frequency region of cues used, and not used, by cochlear implant (CI) recipients. Speech and environmental sound recognition by individuals with CI and normal-hearing (NH) was measured. Gradients were also computed to evaluate the pattern of change in identification performance with respect to the low-pass filtering or high-pass filtering cutoff frequencies.

Subjects and Methods

Frequency-limiting effects were implemented in the acoustic waveforms by passing the signals through low-pass filters (LPFs) or high-pass filters (HPFs) with seven different cutoff frequencies. Identification of Korean vowels and consonants produced by a male and female speaker and environmental sounds was measured. Crossover frequencies were determined for each identification test, where the LPF and HPF conditions show the identical identification scores.

Results

CI and NH subjects showed changes in identification performance in a similar manner as a function of cutoff frequency for the LPF and HPF conditions, suggesting that the degraded spectral information in the acoustic signals may similarly constraint the identification performance for both subject groups. However, CI subjects were generally less efficient than NH subjects in using the limited spectral information for speech and environmental sound identification due to the inefficient coding of acoustic cues through the CI sound processors.

Conclusions

This finding will provide vital information in Korean for understanding how different the frequency information is in receiving speech and environmental sounds by CI processor from normal hearing.

Copyright © 2019. Korean Association of Medical Journal Editors.