Frequency-place mismatch often occurs after cochlear implantation, yet its effect on speech perception outcome remains unclear. In this article, we propose a method, based on cochlea imaging, to determine the cochlear place-frequency map. We evaluated the effect of frequency-place mismatch on speech perception outcome in subjects implanted with 3 different lengths of electrode arrays. A deeper insertion was responsible for a larger frequency-place mismatch and a decreased and delayed speech perception improvement by comparison with a shallower insertion, for which a similar but slighter effect was noticed. Our results support the notion that selecting an electrode array length adapted to each individual's cochlear anatomy may reduce frequency-place mismatch and thus improve speech perception outcome.
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Objectives: To provide a level-adjusted correction to the current standard relating anatomical cochlear place to characteristic frequency in humans, and to re-evaluate anatomical frequency mismatch in cochlear implant (CI) recipients considering this correction. It is hypothesized that a level-adjusted place-frequency function may represent a more accurate tonotopic benchmark for CIs in comparison to the current standard.
Design: The present analytical study compiled data from fifteen previous animal studies that reported iso-intensity responses from cochlear structures at different stimulation levels.
Frequency-to-Place Mismatch Impacts Cochlear Implant Quality of Life, But Not Speech Recognition.
Laryngoscope
June 2024
Department of Otolaryngology-Head and Neck Surgery, Medical University of South Carolina, Charleston, South Carolina, U.S.A.
Article Synopsis
- The study aimed to compare frequency-place mismatch in adult cochlear implant (CI) recipients using different types of electrode arrays (lateral wall and perimodiolar/mid scala) and assess their impact on speech recognition and quality of life after 3 months.
- Researchers examined 126 adult participants, measuring angular insertion depth and semitone mismatch via CT scans and evaluating speech recognition using standard tests.
- Findings showed that lateral wall arrays had deeper insertion and less semitone mismatch, but no significant relationship was found between mismatch and early speech perception; however, greater mismatch negatively affected quality of life for those with perimodiolar arrays.
Assessment of Frequency-Place Mismatch by Flat-Panel CT and Correlation With Cochlear Implant Performance.
Otol Neurotol
January 2021
Department of Neuroradiology, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico.
Objective: To calculate the frequency allocation mismatch in a group of very selected cochlear implant (CI) recipients and to contrast it with the speech perception performances.
Study Design: Cross-sectional observational prospective study.
Settings: Tertiary Audiological Department, University hospital.
Comparison of Place-versus-Pitch Mismatch between a Perimodiolar and Lateral Wall Cochlear Implant Electrode Array in Patients with Single-Sided Deafness and a Cochlear Implant.
Audiol Neurootol
February 2020
Department of Otorhinolaryngology and Head and Neck Surgery, University Medical Center Utrecht, Utrecht, The Netherlands.
Background: In electric-acoustic pitch matching experiments in patients with single-sided deafness and a cochlear implant, the observed "mismatch" between perceived pitch and predicted pitch, based on the amended Greenwood frequency map, ranges from -1 to -2 octaves. It is unknown if and how this mismatch differs for perimodiolar versus lateral wall electrode arrays.
Objectives: We aimed to investigate if the type of electrode array design is of influence on the electric-acoustic pitch match.
Early Sentence Recognition in Adult Cochlear Implant Users.
Ear Hear
January 2020
Service ORL, CHU Toulouse, Toulouse, France.
Objective: Normal-hearing subjects listening to acoustic simulations of cochlear implants (CI) can obtain sentence recognition scores near 100% in quiet and in 10 dB signal-to-noise ratio (SNR) noise with acute exposure. However, average sentence recognition scores for real CI listeners are generally lower, even after months of experience, and there is a high degree of heterogeneity. Our aim was to identify the relative importance and strength of factors that prevent CI listeners from achieving early, 1-mo scores as high as those for normal-hearing-listener acoustic simulations.
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