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Articles

Audiovisual asynchrony detection and speech perception in hearing-impaired listeners with cochlear implants: A preliminary analysis

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Pages 321-333 | Received 03 Apr 2008, Published online: 21 Jul 2009
 

Abstract

This preliminary study examined the effects of hearing loss and aging on the detection of AV asynchrony in hearing-impaired listeners with cochlear implants. Additionally, the relationship between AV asynchrony detection skills and speech perception was assessed. Individuals with normal-hearing and cochlear implant recipients were asked to make judgments about the synchrony of AV speech. The cochlear implant recipients also completed three speech perception tests, the CUNY, HINT sentences, and the CNC test. No significant differences were observed in the detection of AV asynchronous speech between the normal-hearing listeners and the cochlear implant recipients. Older adults in both groups displayed wider timing windows, over which they identified AV asynchronous speech as being synchronous, than younger adults. For the cochlear implant recipients, no relationship between the size of the temporal asynchrony window and speech perception performance was observed. The findings from this preliminary experiment suggest that aging has a greater effect on the detection of AV asynchronous speech than the use of a cochlear implant. Additionally, the temporal width of the AV asynchrony function was not correlated with speech perception skills for hearing-impaired individuals who use cochlear implants.

Abbreviations
AV=

Audiovisual

CNC=

Consonant-nucleus-consonant

CUNY=

City University of New York

FWHM=

Full-width half maximum

HINT=

Hearing in noise test

MPS=

Mean point of synchrony

Abbreviations
AV=

Audiovisual

CNC=

Consonant-nucleus-consonant

CUNY=

City University of New York

FWHM=

Full-width half maximum

HINT=

Hearing in noise test

MPS=

Mean point of synchrony

Abstract

Este estudio preliminar examinó los efectos de la pérdida auditiva y la edad en la detección de la asincronía AV en sujetos con impedimentos auditivos con implantes cocleares. Adicionalmente se evaluó la relación entre las habilidades de detección de asincronía AV y la percepción auditiva. Se pidió a normo-oyentes y a usuarios de implantes cocleares que hicieran juicios acerca de la asincronía AV del habla. Los usuarios de implantes cocleares también completaron tres pruebas de percepción del habla: el CUNY, las frases HINT y la prueba CNC. No se observaron diferencias significativas en la detección de habla AV asincrónica entre los normo-oyentes y los usuarios de implantes cocleares. Los adultos mayores en ambos grupos, mostraron ventanas de tiempo más amplias en las cuales identificaron habla AV asincrónica como si fuera sincrónica, que los adultos jóvenes. No se observó relación entre el tamaño de la ventana de asincronía temporal y el rendimiento en la percepción del lenguaje en los usuarios de implantes cocleares. Los hallazgos de este experimento preliminar sugieren que la edad tiene un efecto mayor en la detección de la asincronía AV del habla que el uso de un implante coclear. Adicionalmente, la anchura temporal de la función de asincronía AV no se relacionó con las habilidades de percepción del habla en hipoacúsicos que usan implantes cocleares.

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