Electric-acoustic pitch comparisons in single-sided-deaf cochlear implant users: frequency-place functions and rate pitch. 2014

Reinhold Schatzer, and Katrien Vermeire, and Daniel Visser, and Andreas Krenmayr, and Mathias Kals, and Maurits Voormolen, and Paul Van de Heyning, and Clemens Zierhofer
Institute of Mechatronics, University of Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria. Electronic address: reinhold.schatzer@uibk.ac.at.

Eight cochlear implant users with near-normal hearing in their non-implanted ear compared pitch percepts for pulsatile electric and acoustic pure-tone stimuli presented to the two ears. Six subjects were implanted with a 31-mm MED-EL FLEX(SOFT) electrode, and two with a 24-mm medium (M) electrode, with insertion angles of the most apical contacts ranging from 565° to 758°. In the first experiment, frequency-place functions were derived from pure-tone matches to 1500-pps unmodulated pulse trains presented to individual electrodes and compared to Greenwood's frequency position map along the organ of Corti. While the overall median downward shift of the obtained frequency-place functions (-0.16 octaves re. Greenwood) and the mean shifts in the basal (<240°; -0.33 octaves) and middle (-0.35 octaves) regions were statistically significant, the shift in the apical region (>480°; 0.26 octaves) was not. Standard deviations of frequency-place functions were approximately half an octave at electrode insertion angles below 480°, increasing to an octave at higher angular locations while individual functions were gradually leveling off. In a second experiment, subjects matched the rates of unmodulated pulse trains presented to individual electrodes in the apical half of the array to low-frequency pure tones between 100 Hz and 450 Hz. The aim was to investigate the influence of electrode place on the salience of temporal pitch cues, for coding strategies that present temporal fine structure information via rate modulations on select apical channels. Most subjects achieved reliable matches to tone frequencies from 100 Hz to 300 Hz only on electrodes at angular insertion depths beyond 360°, while rate-matches to 450-Hz tones were primarily achieved on electrodes at shallower insertion angles. Only for electrodes in the second turn the average slopes of rate-pitch functions did not differ significantly from the pure-tone references, suggesting their use for the encoding of within-channel fine frequency information via rate modulations in temporal fine structure stimulation strategies.

UI MeSH Term Description Entries
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D010898 Pitch Perception A dimension of auditory sensation varying with cycles per second of the sound stimulus. Perception, Pitch,Perceptions, Pitch,Pitch Perceptions
D011474 Prosthesis Design The plan and delineation of prostheses in general or a specific prosthesis. Design, Prosthesis,Designs, Prosthesis,Prosthesis Designs
D012048 Correction of Hearing Impairment Procedures for correcting HEARING DISORDERS. Correction of Auditory Perception,Habilitation of Hearing Impairment,Hearing Impaired Rehabilitation,Rehabilitation of Hearing Impaired,Audiologic Habilitation,Audiologic Rehabilitation,Aural Habilitation,Aural Rehabilitation,Correction of Hearing Loss,Habilitation of Hearing Impaired,Rehabilitation of Hearing Impairment,Audiologic Habilitations,Audiologic Rehabilitations,Auditory Perception Correction,Auditory Perception Corrections,Aural Habilitations,Aural Rehabilitations,Habilitation, Audiologic,Habilitation, Aural,Habilitations, Audiologic,Habilitations, Aural,Hearing Impaired Habilitation,Hearing Impaired Habilitations,Hearing Impairment Correction,Hearing Impairment Corrections,Hearing Impairment Habilitation,Hearing Impairment Habilitations,Hearing Impairment Rehabilitation,Hearing Impairment Rehabilitations,Hearing Loss Correction,Hearing Loss Corrections,Impaired Habilitation, Hearing,Impaired Habilitations, Hearing,Impairment Correction, Hearing,Impairment Corrections, Hearing,Impairment Habilitation, Hearing,Impairment Habilitations, Hearing,Impairment Rehabilitation, Hearing,Impairment Rehabilitations, Hearing,Loss Correction, Hearing,Loss Corrections, Hearing,Perception Correction, Auditory,Perception Corrections, Auditory,Rehabilitation, Audiologic,Rehabilitation, Aural,Rehabilitation, Hearing Impaired,Rehabilitations, Audiologic,Rehabilitations, Aural
D003054 Cochlear Implants Electronic hearing devices typically used for patients with normal outer and middle ear function, but defective inner ear function. In the COCHLEA, the hair cells (HAIR CELLS, VESTIBULAR) may be absent or damaged but there are residual nerve fibers. The device electrically stimulates the COCHLEAR NERVE to create sound sensation. Auditory Prosthesis,Cochlear Prosthesis,Implants, Cochlear,Auditory Prostheses,Cochlear Implant,Cochlear Prostheses,Implant, Cochlear,Prostheses, Auditory,Prostheses, Cochlear,Prosthesis, Auditory,Prosthesis, Cochlear
D006311 Hearing Disorders Conditions that impair the transmission of auditory impulses and information from the level of the ear to the temporal cortices, including the sensorineural pathways. Distorted Hearing,Dysacusis,Paracousis,Paracusis,Hearing Disorder,Hearing, Distorted
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000161 Acoustic Stimulation Use of sound to elicit a response in the nervous system. Auditory Stimulation,Stimulation, Acoustic,Stimulation, Auditory
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D001301 Audiometry, Pure-Tone Measurement of hearing based on the use of pure tones of various frequencies and intensities as auditory stimuli. Audiometry, Bekesy,Audiometry, Pure Tone,Bekesy Audiometry,Pure-Tone Audiometry

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