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Original Articles

Effect of presentation level on diagnosis of dead regions using the threshold equalizing noise test

, , , , , , & show all
Pages 55-62 | Received 24 Apr 2008, Published online: 07 Jul 2009
 

Abstract

The effect of the level of threshold equalizing noise (TEN) on the diagnosis of dead regions (DRs) was investigated. Participants comprised 23 adults with sensorineural hearing impairment. Masked thresholds were measured monaurally with TEN at 60, 70, 80, and 90 dB HL/ERBN. Absolute and masked thresholds (with TEN at 80 dB HL/ERBN) were retested. The diagnosis was unaffected by TEN level at any frequency for eight of the 13 participants who met the criteria for a DR. For four of the latter, increasing the TEN level changed the diagnosis from DR to no DR, mainly at 1.5 kHz, corresponding to the edge frequency, fe, of the DR. For one participant with a low-frequency DR, increasing the TEN level changed the diagnosis from no DR to DR, only at 1 kHz. The changes with level were too large to be explained in terms of test repeatability. Overall, the results of the TEN test are usually not affected by TEN level, except for test frequencies close to fe when absolute thresholds are near-normal for frequencies adjacent to fe.

Abbreviations
CF=

Characteristic frequencies

DR=

Dead regions

ERB=

Equivalent rectangular bandwidth

IHC=

Inner hair cells

PTC=

Psychophysical tuning curve

TEN=

Threshold equalizing noise

Abbreviations
CF=

Characteristic frequencies

DR=

Dead regions

ERB=

Equivalent rectangular bandwidth

IHC=

Inner hair cells

PTC=

Psychophysical tuning curve

TEN=

Threshold equalizing noise

Sumario

Se investigó el efecto de la prueba de ecualización de umbrales con ruido (TEN) en el diagnóstico de regiones muertas (DRs). Los participantes fueron 23 adultos con hipoacusia sensorineural. Los umbrales de enmascaramiento se midieron monoauralmente con TEN a 60, 70,80 y 90dB HL/ERBN. Se midieron nuevamente los umbrales absolutos y enmascarados (con TEN a 80 dB HL/ERBN). El diagnóstico no fue afectado por los niveles de TEN en ninguna frecuencias en ocho de los 13 participantes que cumplían los criterios de presentar DR. En cuatro de ellos, al aumentar el nivel TEN el diagnóstico cambió de DR a no tener DR, principalmente a 1.5kHz, correspondiendo con la frecuencia marginal, fe de la DR. En el caso de uno de los participantes con DR en frecuencias graves, al incrementar el nivel TEN, cambió el diagnóstico de no tener DR a si tenerlo sólo a 1 kHz. Los cambios con el nivel fueron demasiado grandes para ser explicados en términos de reproducibilidad de la prueba. Incluso, los resultados de la prueba TEN generalmente no son afectados por el nivel TEN, excepto para frecuencias cercanas a la fe, cuando los umbrales absolutos son cercanos a lo normal en las frecuencias adyacentes a la fe.

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