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Updated: May 26, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
Published on: March 24, 2023
Interaction between electric and acoustic cues in diotic condition for speech perception in quiet and noise by
Céline Richard1, Evelyne Ferrary, Stéphanie Borel
1Otolaryngology Department, APHP, Hôpital Beaujon, Clichy, France.
Objective:
This study aimed to evaluate the interaction of electric and acoustic cues in diotic condition in cochlear implantees.
Materials And Methods:
Five adult cochlear implantees with residual contralateral hearing were prospectively evaluated in hearing aid only (HA), cochlear implant only (CI), and HA + CI modes by audiometry (pure tone, dissyllabic words, and sentences), and sound quality questionnaires. CI electrodes corresponding to preserved frequencies in the contralateral ear (free-field aided thresholds, <50 dB) were then deactivated, and patients were retested after 20 to 30 days.
Results:
Sentences in silence showed a benefit of CI and the additive effect of HA + CI. As expected, performances with CI alone decreased after apical electrode deactivation. In contrast, speech performances (Marginal Benefit from Acoustic Amplification sentences) in HA + CI mode were not altered by electrode deactivation in silence (90 ± 5.9% before versus 81 ± 10.1% after deactivation, not significant, 2-way analysis of variance) or in noise (78 ± 4.8% before versus 66 ± 11.9% after deactivation, not significant, 2-way analysis of variance). Performances for dissyllabic words confirmed these results. Questionnaires showed a significant compensation of partial electrode deactivation by the contralateral hearing. Moreover, the human voice was reported to be significantly less metallic.
Conclusion:
These results suggested a significant complementarity of acoustic and electric diotic cues but also some redundancy affecting the sound quality.
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