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Updated: Apr 21, 2026
Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation
Published on: October 11, 2024
Evaluation of a cochlear-implant processing strategy incorporating phantom stimulation and asymmetric pulses
Robert P Carlyon1, Jolijn Monstrey, John M Deeks
1* MRC Cognition & Brain Sciences Unit , Cambridge , UK.
Objective:
To evaluate a speech-processing strategy in which the lowest frequency channel is conveyed using an asymmetric pulse shape and "phantom stimulation", where current is injected into one intra-cochlear electrode and where the return current is shared between an intra-cochlear and an extra-cochlear electrode. This strategy is expected to provide more selective excitation of the cochlear apex, compared to a standard strategy where the lowest-frequency channel is conveyed by symmetric pulses in monopolar mode. In both strategies all other channels were conveyed by monopolar stimulation.
Design:
Within-subjects comparison between the two strategies. Four experiments: (1) discrimination between the strategies, controlling for loudness differences, (2) consonant identification, (3) recognition of lowpass-filtered sentences in quiet, (4) sentence recognition in the presence of a competing speaker.
Study Sample:
Eight users of the Advanced Bionics CII/Hi-Res 90k cochlear implant.
Results:
Listeners could easily discriminate between the two strategies but no consistent differences in performance were observed.
Conclusions:
The proposed method does not improve speech perception, at least in the short term.
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