Speech, timbre, and pitch perception in cochlear implant users after chronic use with flat panel CT-based frequency reallocations

Cochlear implants (CI) utilize default frequency allocation tables (“pitch maps”) to distribute the frequency range important for speech perception across their electrode array. Default pitch maps do not address the significant pitch-place mismatch that is inherent in cochlear implantation, nor the variability between subjects or array lengths. Recent research has utilized postoperative high-resolution flat-panel computed tomography (CT) imaging to measure the precise location of electrode contacts within an individual's cochlea, to generate a custom pitch map and decrease the pitch-place mismatch. The objective was to determine whether chronic use of CT pitch maps would improve CI user performance in the areas of speech and music perception, as compared to the non-custom default pitch maps provided by the CI manufacturer. A cohort of 10 experienced CI users (14 CI ears) were recruited to receive CT scans and then use a custom CT pitch map for 1 month. The efficacy of these maps was mea..., Subjects
Study subject demographics, describe the 10 MED-EL cochlear implant (CI) participants (14 CI ears). Four men and six women participated, with an average age of 64.3 ± 12.2 years. All participants were adults with at least 6 months of CI listening experience, implanted with a MED-EL CI, postlingually deafened, native speakers of American English, and used oral/aural communication as their primary modality of communication. The mean length of CI use was 3.6 ± 1.8 years and the mean duration of severe-profound hearing loss before implantation was 6.9 ± 9.6 years. The CI users utilized a variety of sound processor models and processing strategies. Subjects were excluded if they had intracochlear electrodes with open or short circuits, 4 or more extracochlear electrodes (≥1/3 of the array), or documented concomitant conditions that may affect performance (e.g., cognitive impairment). The Institutional Review Board at the University of California, San Francisco (UCSF) approved this s..., , # Speech, timbre, and pitch perception in cochlear implant users after chronic use with flat panel CT-based frequency reallocations

[https://doi.org/10.5061/dryad.jh9w0vtm2](https://doi.org/10.5061/dryad.jh9w0vtm2)

Data is in comma-separated value format.

## Description of the data and file structure

The top row is headers.

Each subsequent row represents one ear in the study.

* ID: Subject ID
* Currently_Listens_to_Music_HoursPerWeek: Questionnaire responses by subjects indicating the number of hours per week they spend listening to music.
* Formal_Music_Training_NumberOfYears: Questionnaire responses by subjects indicating the number of years of formal musical training they have received in their lifetime.
* V1 - indicates data was obtained on Visit 1
* V2 - indicates data was obtained on Visit 2
* Clin - indicates data was obtained with the Clinical Map (control condition)
* Exp - indicates data was obtained with the CT-Based Experimental Map (experimental condition)

Test metri...