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Vol. 62. Issue 6.
Pages 425-431 (November - December 2011)
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Vol. 62. Issue 6.
Pages 425-431 (November - December 2011)
Original article
Electrophysiological Characterisation of Envelope-Following Responses
Caracterización electrofisiológica del potencial evocado auditivo de seguimiento a la modulación del estímulo acústico
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Eleina Mijares Nodarse��
Corresponding author
, María Cecilia Pérez Abalo, Alejandro Torres Fortuny, Mayrim Vega Hernández
Departamento de Audición y Lenguaje, Centro de Neurociencias de Cuba, La Habana, Cuba
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Table 1. Analysis of the Best Modulation Frequency (BMF) and its Corresponding Amplitude and Residual Noise Level Values for the P1 and P2 Components of the EFRs.
Abstract
Introduction

The auditory ability to discriminate rapid changes in the envelope of language sounds is essential for speech comprehension. This ability is deteriorated in some neurological diseases such as multiple sclerosis, auditory neuropathy, sensorineural hearing loss, presbycusis, and primary developmental language disorder. Envelope-following responses (EFRs) in humans are useful in objective measurement of temporal processing in the auditory nervous system.

Objectives

To evaluate EFRs in healthy younger subjects and to investigate the effects of subject states on the EFRs recorded.

Methods

Eleven young subjects were included; 6 of them were awake and 5 were asleep. EFRs were evoked by white noise carrier stimuli with a sweep of modulation frequencies from 20 to 200Hz presented at 50dB HL.

Results

The EFRs we recorded were similar in all subjects. There were two principal components. During both subject sleep and wakefulness, the first component (located between 30 and 50Hz) was significantly larger than the second component (located between 80 and 110Hz). There was also a significant effect of sleep on the EFR amplitude for the modulation frequencies between 88 and 110Hz, 155 and 165Hz, and 190 and 200Hz. However, there were no significant effects of sleep on the principal EFR components.

Conclusions

These results corroborate the usefulness of the EFR technique for objective measurement of human auditory temporal processing.

Keywords:
Temporal auditory processing
Human envelope-following responses
Language
Human auditory temporal resolution
Subject state
Auditory system
Resumen
Introducción

Comprender el lenguaje implica percibir adecuadamente los cambios temporales que se producen en la amplitud de modulación de los sonidos del habla. La detección de estos cambios disminuye en las afecciones neurológicas como la esclerosis múltiple, la neuropatía auditiva, las hipoacusias neurosensoriales, la presbiacusia y el retraso primario del lenguaje. El potencial evocado auditivo de seguimiento a la envolvente (PEA-SE) permite estudiar electrofisiológicamente la respuesta auditiva a los cambios en la modulación de un estímulo acústico.

Objetivos

Caracterizar el PEA-SE en adultos sanos y estudiar los efectos del sueño sobre este potencial.

Métodos

Se estudiaron 11 sujetos, 6 en condiciones de vigilia y 5 en sueño espontáneo. Se registró el PEA-SE obtenido con un ruido blanco al que se le hizo un barrido de frecuencias de modulación entre 20-200Hz a 50dB HL de intensidad.

Resultados

El PEA-SE mostró una morfología similar en todos los sujetos, caracterizándose por presentar dos componentes principales. La amplitud del primer componente (localizado entre 30-50Hz de modulación) fue significativamente mayor que la del segundo componente (entre 80-110Hz) tanto en los sujetos despiertos como en los dormidos. Existió además un efecto significativo del estado de vigilia sobre la amplitud del PEA-SE para las frecuencias entre 88-110Hz, 155-165Hz y 190-200Hz. Sin embargo, no hubo un efecto significativo del sueño sobre los componentes principales del PEA-SE.

Conclusiones

En este trabajo se corrobora el patrón morfológico del PEA-SE sustentándose su utilidad para el estudio objetivo del procesamiento temporal del sistema auditivo.

Palabras clave:
Procesamiento auditivo temporal
Potencial evocado auditivo de seguimiento a la envolvente
Lenguaje
Estado sueño-vigilia
Sistema auditivo

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