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Abstract
Although measurement of the detection limits of the 80Hz auditory steady-state response (ASSR) has proven to be a reasonably reliable tool in estimating hearing sensitivity in the mid-conventional audiometric frequencies (e.g. 1000 and 2000Hz), results in the literature suggest potentially diminishing performance at 500Hz and above 4000Hz. The primary goal of this work was to examine the accuracy of threshold estimation via ASSR measurement for carriers more toward the audiometric extremes. At the same time, different stimulus and recording protocols than those commonly employed in ASSR testing were examined. Using a two-channel recording system, ASSRs were obtained from 15 normal-hearing young adults for an amplitude-modulated carrier of 250Hz and repeated tone bursts of 10000–16000Hz, gated using a Blackman window. Results attest to the ability to record ASSRs to a wide range of carrier frequencies but also suggest that accuracy of threshold estimation suffers toward the audiometric extremes. Feasibility of ASSR-based high-frequency audiometry is demonstrated in principle, but it is not clear that this method will permit adequate sensitivity and accuracy to support such applications as ototoxicity monitoring.
| Acronyms | ||
| AM | = | Amplitude modulation |
| ASSR | = | Auditory steady-state response |
| ERA | = | Electric response audiometry |
| HF | = | High frequency |
| HL | = | Hearing level |
| HFA | = | High-frequency audiometry |
| SL | = | Sensation level |
| SPL | = | Sound pressure level |
| TB | = | Tone burst |
| Acronyms | ||
| AM | = | Amplitude modulation |
| ASSR | = | Auditory steady-state response |
| ERA | = | Electric response audiometry |
| HF | = | High frequency |
| HL | = | Hearing level |
| HFA | = | High-frequency audiometry |
| SL | = | Sensation level |
| SPL | = | Sound pressure level |
| TB | = | Tone burst |
Sumario
Aun cuando se ha comprobado que las mediciones de los límites de detección de las respuestas auditivas de estado estable (ASSR) son razonablemente confiables como herramienta paraestimar la sensibilidad auditiva en las frecuencias medias convencionales (p.ej. 1 y 2 kHz), los resultados en la literatura sugieren un desempeño potencialmente menor en 0.5 kHz y por arriba de 4 kHz. El objetivo principal de este trabajo fue examinar la exactitud de la estimación de umbral por medio de mediciones de ASSR para frecuencias portadoras en los extremos audiométricos. Al mismo tiempo, se examinaron diferentes protocolos comúnmente utilizados en las pruebas de ASSR. Se obtuvieron ASSR de 15 sujetos jóvenes normoyentes utilizando un equipo de dos canales, con una frecuencia portadora de amplitud modulada a 0.25 kHz y tonos Burst repetidos de 10–16 kHz, con método Blackman. Los resultados avalan la capacidad para obtener ASSR en un amplio espectro de frecuencias portadoras, pero también sugieren que la precisión en la estimación de los umbrales disminuye en los extremos audiométricos. En principio se demuestra la factibilidad de la audiometría de alta frecuencia basada en ASSR, pero no es claro que este método tenga la sensibilidad ni la precisión que pueda permitir aplicaciones tales como el monitoreo de ototoxicidad.
