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Abstract
Tone-evoked Auditory Brainstem Responses (tone-burst ABRs) and Auditory Steady-State Responses (ASSRs) with 40 or 90 Hz amplitude modulation (AM) were compared, using the same equipment and recording parameters, to determine which of these three methods most accurately approached the behavioural hearing thresholds in response to 500 Hz and 2000 Hz stimuli in eleven awake adults with normal hearing.
Estimates of the thresholds obtained with the three methods were 10, 18, and 26 dB SL at 500 Hz; and 10, 12, and 22 dB SL at 2000 Hz; using 40 Hz ASSR, 90 Hz ASSR, and tone-burst ABR, respectively. ASSRs with 40 Hz AM stimuli produced significantly better results (lowest thresholds with SD = 0), whereas the wave-V analysis on the tone-burst ABR produced the poorest results. In the averaged ABRs, a robust steady-state potential was also visible. Analysis of those steady-state responses showed estimated thresholds of 13 and 14 dB SL (at 500 and 2000 Hz, respectively), thus considerably better than the estimated thresholds from the wave-V analysis.
It is concluded that the 40 Hz ASSR showed superior results, especially at 500 Hz.
Sumario
Utilizando el mismo equipo y los mismos parámetros de prueba, se compararon las respuestas auditivas de tallo cerebral evocadas por tonos ABR de burst tonales y las respuestas auditivas de estado estable (ASSR) con 40 o 90 Hz de modulación de amplitud (AM), para determinar cual de estos tres métodos se aproximaba con mayor exactitud a los umbrales auditivos comportamentales en 500 y 2000 Hz, en 11 adultos normoyentes despiertos.
La estimación de los umbrales obtenidos con los tres métodos fueron 10, 18 y 26 dBSL a 500 Hz y 10, 12 y 22 dBSL a 2000 Hz con 40 Hz ASSR, 90 Hz ASSR y ABR de pips tonales, respectivamente. Las ASSR con estímulo de 40 Hz AM produjeron resultados significativamente mejores (umbral menor con SD = 0), mientras que el análisis de la onda V en los ABR con burst tonales generó los resultados más pobres. En los ABR promediados, se pudo observar un potencial de estado estable robusto. El análisis de las respuestas de estado estable mostró umbrales estimados de 13 y 14 dBSL (500 y 2000 Hz, respectivamente), que son considerablemente mejores que los umbrales del análisis de la onda V. Se concluye que las ASSR de 40 Hz muestran resultados superiores, especialmente a 500 Hz.
| Abbreviations | ||
| ABR | = | Auditory brainstem response |
| AM | = | Amplitude modulated |
| ASSR | = | Auditory steady-state response |
| EEG | = | Electroencephalogram |
| LRL | = | Lowest response level |
| SD | = | Standard deviation |
| SNR | = | Signal to noise ratio |
| Abbreviations | ||
| ABR | = | Auditory brainstem response |
| AM | = | Amplitude modulated |
| ASSR | = | Auditory steady-state response |
| EEG | = | Electroencephalogram |
| LRL | = | Lowest response level |
| SD | = | Standard deviation |
| SNR | = | Signal to noise ratio |