title: Deactivating Cochlear Implant Electrodes Based on Pitch Information for Users of the ACE Strategy.
abstract: There is a wide range in performance for cochlear implant (CI) users and there is some evidence to suggest that implant fitting can be modified to improve performance if electrodes that do not provide distinct pitch information are de-activated. However, improvements in performance may not be the same for users of all CI devices; in particular for those with Cochlear devices using n-of-m strategies (ACE or SPEAK).The goal of this research was to determine for users of Cochlear devices (CP810 or CP900 series processors) if speech perception could be improved when indiscriminable electrodes were de-activated and this was also compared to when the same number of discriminable electrodes were de-activated.A cross-over study was conducted with 13 adult CI users who received experimental maps with de-activated channels for a minimum of 2 months and these were compared to optimised clinical maps.The findings showed that there were no significant benefits of electrode de-activation on speech perception and that there was a significant deterioration in spectro-temporal ripple perception when electrodes were switched off. There were no significant differences between de-activation of discriminable or indiscriminable electrodes.These findings suggest that electrode de-activation with n-of-m strategies may not be beneficial.
authors.affiliation: UCL Ear Institute, 332 Grays Inn Road, WC1X 8EE, London, UK. d.vickers@ucl.ac.uk.
authors.forename: Deborah
authors.initials: D
authors.lastname: Vickers
authors.affiliation: UCL Ear Institute, 332 Grays Inn Road, WC1X 8EE, London, UK.
authors.forename: Aneeka
authors.initials: A
authors.lastname: Degun
authors.affiliation: UCL Ear Institute, 332 Grays Inn Road, WC1X 8EE, London, UK.
authors.forename: Angela
authors.initials: A
authors.lastname: Canas
authors.affiliation: Cochlear Technology Centre, Schaliënhoevedreef 20, building I, 2800, Mechelen, Belgium.
authors.forename: Thomas
authors.initials: T
authors.lastname: Stainsby
authors.affiliation: Cochlear Technology Centre, Schaliënhoevedreef 20, building I, 2800, Mechelen, Belgium.
authors.forename: Filiep
authors.initials: F
authors.lastname: Vanpoucke
mesh_terms: D000328:Adult; D003054:Cochlear Implants; D018592:Cross-Over Studies; D004566:Electrodes; D006801:Humans; D016037:Single-Blind Method; D013067:Speech Perception
keywords: ACE strategy; Cochlear implant; Electrode deactivation; Electrode discrimination; Electrode-neurone interface; Fitting; Mapping; Pitch ranking; Speech perception; n-of-m