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Sensibilidad a la modulación espectrotemporal en usuarios de implantes cocleares: Impacto del portador de ruido y
Marlies Geys1, Leanne Sijgers1, Timona Leandra Oesch1
1Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Zurich, University of Zurich, 8091 Zurich, Switzerland.
The Journal of the Acoustical Society of America
|February 10, 2026
Resumen
Los usuarios de implantes cocleares (IC) detectaron mejor las modulaciones espectrales con un portador de tonos complejo que con el ruido rosado. Esto sugiere que el tipo de portador impacta en la percepción de la modulación espectrotemporal, potencialmente debido a la reducción del aliasing espectral.
Área de la Ciencia:
- La neurociencia auditiva es una neurociencia auditiva.
- Procesamiento de señales Procesamiento de señales.
- Interacción hombre-computadora Interacción hombre-computadora.
Sus antecedentes:
- Las pruebas de modulación espectrotemporal evalúan la resolución espectral y temporal en usuarios de implantes cocleares (IC).
- Comprender cómo los diferentes tipos de portadores afectan la detección de modulación es crucial para optimizar el procesamiento de sonido de CI.
Objetivo del estudio:
- Investigar la influencia del tipo de portador (tono complejo frente al ruido rosado) en la detección de la modulación espectrotemporal en usuarios de IC.
- Para examinar la función de transferencia de modulación espectral (SMTF) con diferentes portadores y densidades de modulación.
- Explorar las posibles limitaciones de procesamiento de dispositivos en regiones de frecuencia específicas.
Principales métodos:
- Diecinueve usuarios de CI realizaron una tarea de tiempo de reacción para detectar modulaciones espectrales y / o temporales.
- Los estímulos usaron tonos complejos (87 sinusoides de fase aleatoria) o portadores de ruido rosado.
- Se probaron estímulos de ancho de banda limitado de 2 octavas en ruido rosa de banda ancha, centrado de 500 a 4000 Hz.
Principales resultados:
- Las modulaciones espectrales densas se detectaron más fácilmente con el portador de tonos complejo, contrariamente a las expectativas.
- El portador de ruido rosa mostró un típico perfil SMTF de paso bajo.
- La sensibilidad de detección fue más baja a 500 Hz, respaldada por simulaciones de electrodogramas.
Conclusiones:
- El tipo de portador influye significativamente en la detección de la modulación espectrotemporal en los usuarios de IC.
- Los portadores de tonos complejos pueden reducir el aliasing espectral, mejorando la detección de modulaciones espectrales densas.
- Una menor sensibilidad a bajas frecuencias (500 Hz) sugiere limitaciones potenciales de procesamiento de CI en los sitios de electrodos apicales.
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