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Efferent control of the human audito...

The University of Arizona., Speech, Language, & Hearing Sciences.

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Efferent control of the human auditory system.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Efferent control of the human auditory system./
Author:	Garinis, Angela Constance.
Description:	206 p.
Notes:	Adviser: Barbara K. Cone-Wesson.
Contained By:	Dissertation Abstracts International69-08B.
Subject:	Health Sciences, Audiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3316330
ISBN:	9780549692065

Efferent control of the human auditory system.
Garinis, Angela Constance.

Efferent control of the human auditory system. - 206 p.

Adviser: Barbara K. Cone-Wesson.

Thesis (Ph.D.)--The University of Arizona, 2008.

The effects of auditory efferent activity on peripheral physiology may be examined by presenting broadband noise (BBN) to the contralateral ear during otoacoustic emission (OAE) recordings. The presentation of BBN typically produces a reduction of OAE amplitudes in comparison to a condition without BBN. This is termed contralateral suppression. Limited information exists regarding the effects of contralateral BBN on responses observed at higher levels in the auditory system. The present study employed this paradigm to investigate interactions of attention and laterality on the transient evoked otoacoustic emission (TEOAE), auditory brainstem response (ABR) and cortical auditory evoked potentials (CAEP) P1-N1-P2. TEOAEs were evoked by 60 dB SPL clicks; ABRs and CAEPs were evoked by 60 dB SPL 2.0 kHz tone pips in 15 normally hearing adults. Four conditions were employed for each ear: (1) quiet (no noise); (2) 60 dB SPL contralateral BBN; (3) words (at -3 dB SNR) embedded in 60 dB SPL contralateral BBN while subjects classified words as animal versus food items; (4) words from condition #3 played backwards and embedded in 60 dB SPL contralateral BBN. For TEOAEs: (1) more suppression was evident in the active attention condition than the passive listening conditions and (2) right ear OAE amplitudes for the 8-18 ms time period exhibited more suppression in the presence of BBN for all noise conditions, although this did not meet statistical significance. For the ABR experiment, amplitudes in the noise conditions decreased in all epochs for the right ear, but not for the left. For the CAEP experiment, asymmetries were evident in temporal regions and an effect of contralateral noise was evident. The outcome of this investigation suggests that efferent activation by noise and active attention has diverse modulatory effects on electroacoustic and electrophysiologic responses along the auditory pathway.

ISBN: 9780549692065Subjects--Topical Terms:

1018138
Health Sciences, Audiology.

Efferent control of the human auditory system.
LDR:02792nam 2200277 a 45 001 857053
005 20100709
008 100709s2008 ||||||||||||||||| ||eng d
020 $a 9780549692065
035 $a (UMI)AAI3316330
035 $a AAI3316330
040 $a UMI $c UMI
100 1 $a Garinis, Angela Constance. $3 1023970
245 1 0 $a Efferent control of the human auditory system.
300 $a 206 p.
500 $a Adviser: Barbara K. Cone-Wesson.
500 $a Source: Dissertation Abstracts International, Volume: 69-08, Section: B, page: 4640.
502 $a Thesis (Ph.D.)--The University of Arizona, 2008.
520 $a The effects of auditory efferent activity on peripheral physiology may be examined by presenting broadband noise (BBN) to the contralateral ear during otoacoustic emission (OAE) recordings. The presentation of BBN typically produces a reduction of OAE amplitudes in comparison to a condition without BBN. This is termed contralateral suppression. Limited information exists regarding the effects of contralateral BBN on responses observed at higher levels in the auditory system. The present study employed this paradigm to investigate interactions of attention and laterality on the transient evoked otoacoustic emission (TEOAE), auditory brainstem response (ABR) and cortical auditory evoked potentials (CAEP) P1-N1-P2. TEOAEs were evoked by 60 dB SPL clicks; ABRs and CAEPs were evoked by 60 dB SPL 2.0 kHz tone pips in 15 normally hearing adults. Four conditions were employed for each ear: (1) quiet (no noise); (2) 60 dB SPL contralateral BBN; (3) words (at -3 dB SNR) embedded in 60 dB SPL contralateral BBN while subjects classified words as animal versus food items; (4) words from condition #3 played backwards and embedded in 60 dB SPL contralateral BBN. For TEOAEs: (1) more suppression was evident in the active attention condition than the passive listening conditions and (2) right ear OAE amplitudes for the 8-18 ms time period exhibited more suppression in the presence of BBN for all noise conditions, although this did not meet statistical significance. For the ABR experiment, amplitudes in the noise conditions decreased in all epochs for the right ear, but not for the left. For the CAEP experiment, asymmetries were evident in temporal regions and an effect of contralateral noise was evident. The outcome of this investigation suggests that efferent activation by noise and active attention has diverse modulatory effects on electroacoustic and electrophysiologic responses along the auditory pathway.
590 $a School code: 0009.
650 4 $a Health Sciences, Audiology. $3 1018138
650 4 $a Psychology, Cognitive. $3 1017810
690 $a 0300
690 $a 0633
710 2 $a The University of Arizona. $b Speech, Language, & Hearing Sciences. $3 1023969
773 0 $t Dissertation Abstracts International $g 69-08B.
790 $a 0009
790 1 0 $a Cone-Wesson, Barbara K., $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3316330