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Title
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Neural tonotopy in cochlear implants : an evaluation in unilateral cochlear implant patients with unilateral deafness and tinnitus
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Author
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Abstract
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| In cochlear implants, the signal is filtered into different frequency bands and transmitted to electrodes along the cochlea. In this study the frequency-place function for electric hearing was investigated as a means to possibly improve speech coding by delivering information to the appropriate cochlear place. Fourteen subjects with functional hearing in the contralateral ear have been provided with a MED-EL cochlear implant in the deaf ear in order to reduce intractable tinnitus. Pitch scaling experiments were performed using single-electrode, constant-amplitude, constant-rate stimuli in the implanted ear, and acoustic sinusoids in the contralateral ear. The frequency-place function was calculated using the electrode position in the cochlea as obtained from postoperative skull radiographs. Individual frequency-place functions were compared to Greenwoods function in normal hearing. Electric stimulation elicited a low pitch in the apical region of the cochlea, and shifting the stimulating electrode towards the basal region elicited increasingly higher pitch. The frequency-place function did not show a significant shift relative to Greenwoods function. In cochlear implant patients with functional hearing in the non-implanted ear, electrical stimulation produced a frequency-place function that on average resembles Greenwoods function. These results differ from previously derived data. |
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Language
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English
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Source (journal)
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Hearing research. - Amsterdam
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Publication
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Amsterdam
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2008
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ISSN
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0378-5955
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Volume/pages
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245
:1-2
(2008)
, p. 98-106
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ISI
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000261565700013
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Full text (Publisher's DOI)
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