All multi-channel cochlear implants operate on the premise that each electrode stimulates relatively independent neural populations. However, it is likely that the population of nerve fibers that responds to stimulation on one electrode is not completely distinct from the population of fibers that responds to stimulation on another electrode. The extent of channel interaction in a particular cochlear implant has the potential to significantly impact performance. We have been examining channel interaction physiologically using the electrically evoked compound action potential (ECAP). In this study, we compare physiological measures to psychophysical measures obtained using a forward masking paradigm. We hypothesize that the physiological and psychophysical measures of channel interaction should be related. Preliminary data from nine adult Nucleus 24 patients suggest such a correlation may exist.
- Cochlear implant
- Electrically evoked compound action potential
- Forward masking
ASJC Scopus subject areas