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Sobre evocado por el discurso bilateral con las siguientes respuestas: Beneficio e impacto de las asimetrías
Vijayalakshmi Easwar1, Michael Chesnaye1, David W Purcell2,3
1Communication Sciences, National Acoustic Laboratories, Sydney, New South Wales, Australia.
Ear and hearing
|February 10, 2026
Resumen
La estimulación bilateral mejora significativamente las respuestas de seguimiento de sobre evocadas por el habla (EFR) en comparación con la estimulación unilateral, especialmente cerca de los umbrales auditivos. Las EFR de velocidad lenta no se ven afectadas por las diferencias de tiempo, lo que sugiere su utilidad con audífonos unilaterales.
Área de la Ciencia:
- La neurociencia auditiva es una neurociencia auditiva.
- Percepción del habla Percepción del habla
- Ciencia de la audición Ciencia de la audición.
Sus antecedentes:
- Las respuestas de seguimiento de sobre evocadas por el habla (EFR) evalúan el acceso al habla asistida.
- La mayoría de los estudios utilizan estimulación unilateral, que no refleja la escucha bilateral típica.
- Investigar la estimulación bilateral frente a la unilateral y las asimetrías interaurales es crucial.
Objetivo del estudio:
- Determinar los beneficios de la estimulación bilateral sobre la unilateral para las amplitudes de EFR.
- Evaluar la influencia de las diferencias horarias interaurales (ITD) y las diferencias de nivel interaural (ILD) en las EFR.
- Comprender las implicaciones para el ajuste de audífonos y el procesamiento auditivo.
Principales métodos:
- EFRs provocadas en 42 adultos con audición normal usando tokens de habla /sashi/ o /sa/.
- Estímulos presentados unilateralmente y bilateralmente en varios niveles de presión acústica (SPL).
- ITD y ILD simulados para imitar el ajuste unilateral del audífono y la asimetría del umbral auditivo.
Principales resultados:
- Las amplitudes de las EFR bilaterales f0 fueron un 80-127% más grandes que las unilaterales; las EFR de tasa lenta aumentaron un 20-46%.
- Un ITD de 5,6 msec atenuó significativamente las EFR, pero no las EFR de velocidad lenta.
- Las ventajas bilaterales persistieron con los ILD si la audibilidad era suficiente; se observaron interacciones binaurales.
Conclusiones:
- La estimulación bilateral ofrece ventajas significativas para las amplitudes EFR, particularmente cerca de los umbrales auditivos.
- Las EFR de velocidad lenta son robustas para los DTI, lo que sugiere su uso en escenarios unilaterales de audífonos para evitar falsos negativos.
- Las EFR bilaterales demuestran interacciones binaurales, lo que hace avanzar la evaluación audiológica objetiva.
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