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Original Article

Use of a single channel dedicated to conveying enhanced temporal periodicity cues in cochlear implants: Effects on prosodic perception and vowel identification

Uso de un solo canal para la conducción óptima de claves de periodicidad temporal con implantes cocleares. Efectos en la percepción de la prosodia y en la identificación de vocales

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Pages 244-253 | Received 22 Sep 2005, Published online: 07 Jul 2009
 

Abstract

The continuous interleaved sampling (CIS) strategy for cochlear implants has well-established limitations for the perception of pitch changes in speech. This study investigated a modification of CIS in which one channel was dedicated to the transmission of a temporal encoding of fundamental frequency (F0). Normal hearing subjects listening to noise-excited vocoders, and implantees were tested on labelling the pitch movement of diphthongal glides, on using intonation information to identify sentences as question or statement, and on vowel recognition. There were no significant differences between modified processing and CIS in vowel recognition. However, while there was limited evidence of improved pitch perception relative to CIS with simplified F0 modulation applied to the most basal channel, in general it appears that for most implant users, restricting F0-related modulation to one channel does not provide significantly enhanced pitch information.

Abbreviations
ANOVA=

Analysis of variance

CI=

Cochlear implant

CIS=

Continuous interleaved sampling

F0=

Fundamental frequency

rms=

Root mean square

Abbreviations
ANOVA=

Analysis of variance

CI=

Cochlear implant

CIS=

Continuous interleaved sampling

F0=

Fundamental frequency

rms=

Root mean square

Sumario

La estrategia de intercalado continuo de muestras (CIS) en implantes cocleares tiene limitaciones bien establecidas para efectos de percepción de cambios de tonalidad en el lenguaje. Este estudio investiga una modificación del CIS en el cual un canal se dedicó a la transmisión de la codificación temporal de la frecuencia fundamental (F0). Fueron examinados sujetos normo-oyentes al escuchar vocoders activados por ruido, así como implantados a quienes se pidió etiquetar los cambios de tonalidad de las transiciones en diptongos, el uso de la información tonal para identificar oraciones interrogativas o afirmativas y el reconocimiento de vocales. No se apreciaron diferencias significativas entre el procesamiento modificado y el CIS para el reconocimiento de vocales. Sin embargo, mientras que existió una evidencia limitada de mejoramiento de la percepción tonal por el CIS con modulación simplificada de la F0 aplicada al canal más basal, parece, en general, que para la mayoría de implantados, la restricción de la modulación relacionada con la F0 a un solo canal, no proporciona un mejoramiento significativo de la información tonal.

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