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The role of altered auditory feedbac...

Guntupalli, Vijaya Kumar.

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The role of altered auditory feedback in the amelioration of stuttering in children.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The role of altered auditory feedback in the amelioration of stuttering in children./
Author:	Guntupalli, Vijaya Kumar.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2007,
Description:	236 p.
Notes:	Source: Dissertation Abstracts International, Volume: 68-05, Section: B, page: 3004.
Contained By:	Dissertation Abstracts International68-05B.
Subject:	Speech therapy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3266249
ISBN:	9780549043577

The role of altered auditory feedback in the amelioration of stuttering in children.
Guntupalli, Vijaya Kumar.

The role of altered auditory feedback in the amelioration of stuttering in children. - Ann Arbor : ProQuest Dissertations & Theses, 2007 - 236 p.

Source: Dissertation Abstracts International, Volume: 68-05, Section: B, page: 3004.

Thesis (Ph.D.)--East Carolina University, 2007.

The purpose of this investigation was to investigate the role of altered auditory feedback (AAF) in the amelioration of stuttering in children who stutter (CWS). The effects of AAF, such as delayed auditory feedback (DAF) and frequency altered auditory feedback (FAF) on stuttering have been extensively investigated in a large group of adults who stutter and found to be beneficial in the amelioration of stuttering during various speech tasks and difficult speaking situations, while the beneficial effects of AAF in CWS are still unknown per se. Thus, in order to systematically examine the ameliorative effects of AAF in CWS, a series of experiments were designed. The first experiment investigated the immediate effect of delayed auditory feedback (DAF) and frequency altered auditory feedback (FAF) on the frequency of stuttering events. Nine CWS read aloud under non-altered auditory feedback (NAF), a temporal delay of 60 ms (i.e., DAF), and an upward shift in the frequency of speech signal by one-half octave (i.e., FAF). Stuttering frequency was significantly reduced while reading under DAF, and FAF relative to NAF. Approximately, 50% to 65% reduction in the frequency of stuttering events was observed under DAF and FAF relative to NAF. These findings suggest that AAF can significantly increase the fluency of CWS. In Experiment 2, an ABABABA time series design was used to examine the effect of repeated exposure to DAF and FAF on stuttering frequency. Nine CWS read a series of passages continuously under DAF or FAF (i.e., experimental segments) and NAF (i.e., baseline segments). A significant reduction in stuttering frequency was observed during experimental segments relative to baseline segments. There was no statistically significant linear reduction in the frequency of stuttering events between the four baseline segments. These findings demonstrate that the fluency effects of DAF and FAF are stable and powerful. However, carry-over fluency effect was not observed in the baseline segments following the AAF segments. In Experiment 3, 14 naive listeners rated the speech naturalness of speech samples produced by fluent children and speech samples produced by CWS during NAF, DAF, and FAF. Speech produced by CWS under AAF was rated as significantly more natural sounding than speech under NAF. Fluent children's speech was rated as significantly more natural sounding than all speech samples produced by CWS. The fourth experiment investigated the effect of AAF on the proportion and duration of stuttering types. The proportion of part-word repetitions, and inaudible postural fixations/silent blocks were significantly reduced under DAF and FAF relative to NAF. However, the reduction in duration of part-word repetitions and silent blocks did not reach statistical significance. The findings of these experiments have clinical ramifications for the amelioration of stuttering in children.

ISBN: 9780549043577Subjects--Topical Terms:

520446
Speech therapy.

The role of altered auditory feedback in the amelioration of stuttering in children.
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300 $a 236 p.
500 $a Source: Dissertation Abstracts International, Volume: 68-05, Section: B, page: 3004.
500 $a Adviser: Joseph Kalinowski.
502 $a Thesis (Ph.D.)--East Carolina University, 2007.
520 $a The purpose of this investigation was to investigate the role of altered auditory feedback (AAF) in the amelioration of stuttering in children who stutter (CWS). The effects of AAF, such as delayed auditory feedback (DAF) and frequency altered auditory feedback (FAF) on stuttering have been extensively investigated in a large group of adults who stutter and found to be beneficial in the amelioration of stuttering during various speech tasks and difficult speaking situations, while the beneficial effects of AAF in CWS are still unknown per se. Thus, in order to systematically examine the ameliorative effects of AAF in CWS, a series of experiments were designed. The first experiment investigated the immediate effect of delayed auditory feedback (DAF) and frequency altered auditory feedback (FAF) on the frequency of stuttering events. Nine CWS read aloud under non-altered auditory feedback (NAF), a temporal delay of 60 ms (i.e., DAF), and an upward shift in the frequency of speech signal by one-half octave (i.e., FAF). Stuttering frequency was significantly reduced while reading under DAF, and FAF relative to NAF. Approximately, 50% to 65% reduction in the frequency of stuttering events was observed under DAF and FAF relative to NAF. These findings suggest that AAF can significantly increase the fluency of CWS. In Experiment 2, an ABABABA time series design was used to examine the effect of repeated exposure to DAF and FAF on stuttering frequency. Nine CWS read a series of passages continuously under DAF or FAF (i.e., experimental segments) and NAF (i.e., baseline segments). A significant reduction in stuttering frequency was observed during experimental segments relative to baseline segments. There was no statistically significant linear reduction in the frequency of stuttering events between the four baseline segments. These findings demonstrate that the fluency effects of DAF and FAF are stable and powerful. However, carry-over fluency effect was not observed in the baseline segments following the AAF segments. In Experiment 3, 14 naive listeners rated the speech naturalness of speech samples produced by fluent children and speech samples produced by CWS during NAF, DAF, and FAF. Speech produced by CWS under AAF was rated as significantly more natural sounding than speech under NAF. Fluent children's speech was rated as significantly more natural sounding than all speech samples produced by CWS. The fourth experiment investigated the effect of AAF on the proportion and duration of stuttering types. The proportion of part-word repetitions, and inaudible postural fixations/silent blocks were significantly reduced under DAF and FAF relative to NAF. However, the reduction in duration of part-word repetitions and silent blocks did not reach statistical significance. The findings of these experiments have clinical ramifications for the amelioration of stuttering in children.
590 $a School code: 0600.
650 4 $a Speech therapy. $3 520446
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710 2 $a East Carolina University. $3 1019505
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793 $a English
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