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Published on: January 9, 2019
Cortical Auditory Evoked Potentials Recorded From Nucleus Hybrid Cochlear Implant Users.
Carolyn J Brown1, Eun Kyung Jeon, Li-Kuei Chiou
11Department of Communication Sciences and Disorders, University of Iowa, Iowa City, Iowa, USA; 2Department of Otolaryngology-Head and Neck Surgery, University of Iowa, Iowa City, Iowa, USA; and 3Boys Town National Research Hospital, Omaha, Nebraska, USA.
Cortical auditory evoked potentials (CAEPs) did not predict programming benefits for Nucleus Hybrid Cochlear Implant (CI) users. While CAEPs are measurable in CI users, they did not correlate with speech perception outcomes in this study.
Area of Science:
- Audiology
- Neuroscience
- Biomedical Engineering
Background:
- Nucleus Hybrid Cochlear Implant (CI) users utilize both acoustic and electrical stimulation for hearing.
- Optimizing the programming of these dual-stimulation components is crucial for user benefit.
- Assessing outcomes through speech perception and electrophysiological measures is essential.
Purpose of the Study:
- To compare three programming strategies for the Nucleus Hybrid CI.
- To determine if Cortical Auditory Evoked Potentials (CAEPs) can predict speech perception outcomes or listener preference.
- To evaluate if CAEPs can identify users who benefit most from the electrical component of the Hybrid CI.
Main Methods:
- Cortical Auditory Evoked Potentials (CAEPs) were recorded from 10 Nucleus Hybrid CI users.
- Participants were tested with three experimental processor programs (MAPs) featuring varying acoustic-electrical frequency overlap.
- Speech perception was assessed using consonant recognition and signal-to-noise ratio tests; CAEPs included onset and auditory change responses (ACC).
Main Results:
- Performance differences between the three programming strategies were minimal.
- The peak-to-peak amplitude of the ACC did not reliably predict speech perception performance.
- All participants demonstrated improved consonant recognition with combined acoustic and electrical stimulation, with minor changes in cortical responses.
Conclusions:
- CAEPs are measurable in Hybrid CI users and comparable to those in normal-hearing listeners.
- CAEPs, under the conditions of this study, did not prove to be a predictive measure for programming strategy optimization.
- No significant predictive relationship was found between CAEP measures and speech perception outcomes or documenting benefit from the electrical signal.
