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Original Article

Pitch estimation of a deeply inserted cochlear implant electrode

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Pages 363-368 | Received 06 Mar 2003, Accepted 01 Jul 2003, Published online: 07 Jul 2009
 

Abstract

In this short communication, we evaluate the place-pitch relation of a newly designed, deeply inserted, cochlear implant electrode. The insertion depths ranged from 471° to 662°. Pitch perception was measured in eight subjects with monopolar stimulation on each electrode contact at intensities of 50% and 80% of the dynamic range. We observed a monotonic reduction of pitch estimate with insertion depth. For about half of the subjects, a flattening of the pitch estimate at the basal end of the electrode was seen, while for the other half, pitch continued to decrease monotonically up to the most apical part of the array. We conclude that deeper insertion could increase pitch range for at least some cochlear implant recipients, and could hence potentially increase group performance.

Sumario

En este breve comunicado evaluamos la relación de lugartono en un electrodo de implante coclear de inserción profunda disen˜ado recientemente. La profundidad de la inserción varía de 471°A 662°. Se midió la percepción del tono en ocho sujetos con estimulación monopolar en cada contacto del electrodo con intensidades del 50% y 80% del rango dinámico. Observamos una reducción monotónica de la estimación del tono con la inserción profunda. Para casi la mitad de los sujetos se observó un aplanamiento de la estimación del tono en el extremo la punta basal del electrodo, mientras que para la otra mitad el tono continuó disminuyendo monotónicamente hasta la parte más apical del hilo de electrodos. Concluimos que la inserción mas profunda podría aumentar el rango tonal en algunos usuarios de implante coclear y por lo tanto también potencialmente mejorar el desempen˜o del grupo.

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