The Estimated Electrode-Neuron Interface in Cochlear Implant Listeners Is Different for Early-Implanted Children and Late-Implanted Adults
| Autor: | Julie G. Arenberg, Gabrielle O'Brien, Kelly N. Jahn, Mishaela DiNino, Steven M. Bierer |
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| Rok vydání: | 2019 |
| Předmět: |
Auditory perception
medicine.medical_specialty electrical field imaging Adolescent media_common.quotation_subject medicine.medical_treatment Stimulation Audiology 01 natural sciences Imaging data 03 medical and health sciences 0302 clinical medicine children Perception Cochlear implant 0103 physical sciences threshold medicine Humans Child 010301 acoustics Cochlea Aged media_common dynamic range Aged 80 and over business.industry cochlear implant Age Factors Middle Aged Cochlear Implantation Sensory Systems Cochlear Implants medicine.anatomical_structure Otorhinolaryngology impedance Neuron Spiral Ganglion business 030217 neurology & neurosurgery Research Article |
| Zdroj: | JARO: Journal of the Association for Research in Otolaryngology |
| ISSN: | 1438-7573 1525-3961 |
| DOI: | 10.1007/s10162-019-00716-4 |
| Popis: | Cochlear implant (CI) programming is similar for all CI users despite limited understanding of the electrode-neuron interface (ENI). The ENI refers to the ability of each CI electrode to effectively stimulate target auditory neurons and is influenced by electrode position, neural health, cochlear geometry, and bone and tissue growth in the cochlea. Hearing history likely affects these variables, suggesting that the efficacy of each channel of stimulation differs between children who were implanted at young ages and adults who lost hearing and received a CI later in life. This study examined whether ENI quality differed between early-implanted children and late-implanted adults. Auditory detection thresholds and most comfortable levels (MCLs) were obtained with monopolar and focused electrode configurations. Channel-to-channel variability and dynamic range were calculated for both types of stimulation. Electrical field imaging data were also acquired to estimate levels of intracochlear resistance. Children exhibited lower average auditory perception thresholds and MCLs compared with adults, particularly with focused stimulation. However, neither dynamic range nor channel-to-channel threshold variability differed between groups, suggesting that children's range of perceptible current was shifted downward. Children also demonstrated increased intracochlear resistance levels relative to the adult group, possibly reflecting greater ossification or tissue growth after CI surgery. These results illustrate physical and perceptual differences related to the ENI of early-implanted children compared with late-implanted adults. Evidence from this study demonstrates a need for further investigation of the ENI in CI users with varying hearing histories. |
| Databáze: | OpenAIRE |
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