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Abstract
We investigated speech perception advantages arising from the use of inter-aural time difference cues, and from the provision of redundant information by the use of a hearing aid contralateral to a cochlear implant (bimodal hearing devices). Thirty-eight subjects (14 normally hearing and 23 hearing-impaired) participated in this study. The effect of binaural redundancy was assessed by comparing the signal-to-noise ratio (SNR) required for 50% correct identification of sentences in noise when listening monaurally to that when listening binaurally. The use of inter-aural time difference cues was determined by comparing the binaural SNRs obtained with or without a noise delay of 700 µs between ears. Results indicated adults who used bimodal hearing devices benefited from binaural redundancy, but children did not. Whereas normally hearing subjects used inter-aural time difference cues to improve speech perception in noise, neither adults nor children who used bimodal hearing devices were able to do so.
| Abbreviations | ||
| SRT | = | Speech reception threshold |
| SNR | = | Signal-to-noise ratio |
| NH | = | Normally hearing |
| HA | = | Bilateral hearing aids |
| CIHA | = | Cochlear implant and hearing aid |
| Abbreviations | ||
| SRT | = | Speech reception threshold |
| SNR | = | Signal-to-noise ratio |
| NH | = | Normally hearing |
| HA | = | Bilateral hearing aids |
| CIHA | = | Cochlear implant and hearing aid |
Sumario
Investigamos las ventajas en la percepción del lenguaje obtenidas por medio del uso de claves con diferencia de tiempo interaural y cualquier ventaja obtenida de la provisión de información redundante al utilizar un auxiliar auditivo contralateral al implante coclear (esquema bimodal). participaron 36 sujetos en el estudio (14 normoyentes y 23 hipoacúsicos. Se evaluó el efecto de la redundancia binaural comparando la relación señal/ruido (SNR) requerida para obtener una identificación correcta del 50% de oraciones en ruido en condición monoaural frente a la condición binaural. el uso de pautas de diferencia interaural de tiempo se determinó comparando el SNR obtenido con y sin retardo de ruido de 700 µs entre los oídos. los resultados indicaron que los adultos con esquema bimodal se benefician de la redundancia binaural, pero los niños no. mientras que los sujetos normales utilizan las pautas de diferencias interaurales de tiempo para mejorar la percepción del lenguaje en ruido, ni los adultos ni los niños con esquema bimodal fueron capaces de hacerlo.