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Original Articles

TEOAE suppression in adults with learning disabilities

, &
Pages 607-614 | Received 16 Mar 2007, Published online: 07 Jul 2009
 

Abstract

The presentation of contralateral noise during the recording of transient evoked otoacoustic emissions (TEOAEs) reduces the amplitude of the TEOAE in normally-hearing adults. This is known as TEOAE suppression. The present study investigated TEOAE suppression in 18 adults with learning disabilities (LDs) compared to 18 adults without LDs. TEOAEs were elicited by 60 dB p.e. SPL clicks and were suppressed by the presentation of 60 dB SPL contralateral broadband noise. Suppression was measured as a change in the overall TEOAE response amplitude, and also analysed in 2-ms epochs representing different TEOAE frequency-response bands. A significant interaction was evident between group type and ear tested. Participants in the control group had right ear dominance for the suppression effect, whereas the left ear was found to be dominant for the LD group. These findings suggest a mechanism of the medial olivary cochlear bundle and efferent auditory pathway that differs in those with LD compared to those with typical learning abilities.

Abbreviations
ABR=

Auditory brainstem response

APD=

Auditory processing disorders

AR=

Acoustic reflex

LD=

Learning disability

MOCB=

Medial olivary cochlear bundle

TEOAE=

Transient evoked otoacoustic emission

Abbreviations
ABR=

Auditory brainstem response

APD=

Auditory processing disorders

AR=

Acoustic reflex

LD=

Learning disability

MOCB=

Medial olivary cochlear bundle

TEOAE=

Transient evoked otoacoustic emission

Sumario

La presentación de ruido contralateral durante las pruebas de emisiones otoacústicas evocadas por transitorios (TEOAE) reduce la amplitud de las TEOAE en adultos normoyentes. Esto se conoce como supresión de las TEOAE. Este estudio investiga la supresión de las TEOAE en 18 adultos con dificultades en el aprendizaje (LD) comparados con 18 adultos sin LD. Se evocaron las TEOAE con clics contralaterales a 60 dB p.e. SPL con ruido de banda ancha. La supresión se midió como un cambio en la amplitud de las TEOAE y también se analizaron periodos de 2 ms representativos de diferentes bandas de frecuencia de las TEOAE. Fue evidente una interacción significativa entre grupos y oído examinado. Los participantes del grupo control presentaron una dominancia del oído derecho para el efecto de supresión, mientras que en el grupo de LD, el oído dominante fue el izquierdo. Estos hallazgos sugieren un mecanismo del haz olivo-coclear y de la vía auditiva eferente que difiere en quienes tienen una LD y quienes tienen habilidades auditivas típicas.

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