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Switching in adults with aphasia.

Chiou, Hsin-Huei.

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Switching in adults with aphasia.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Switching in adults with aphasia./
Author:	Chiou, Hsin-Huei.
Description:	129 p.
Notes:	Adviser: Mary R. T. Kennedy.
Contained By:	Dissertation Abstracts International68-11B.
Subject:	Health Sciences, Speech Pathology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3287811
ISBN:	9780549308164

Switching in adults with aphasia.
Chiou, Hsin-Huei.

Switching in adults with aphasia. - 129 p.

Adviser: Mary R. T. Kennedy.

Thesis (Ph.D.)--University of Minnesota, 2007.

Previous research has demonstrated that adults with aphasia exhibited difficulties in switching (Kraat, 1990; Purdy, Duffy, & Coelho, 1994; Chiou & Kennedy, 2006). Switching is critical for cognitive flexibility which allows one to shift attention, ideas, sets and responses in a flexible manner (Rende, 2000). Switching requires regulation of processes of both current and previous tasks and the ability to resist interference from previous tasks (Rogers & Monsell, 1995). In this study, fourteen adults with mild or moderate aphasia (experimental group) and fourteen age- and education-matched healthy controls (control group) switched between go/no-go rules with minimized linguistic and cognitive demands. In order to investigate whether adults with aphasia would benefit from knowing what to expect next, both predictable (alternating between visual and auditory modalities) and unpredictable (visual and auditory modalities presented randomly) conditions were designed. Relationships between rule-switching and other executive function measures involving switching process were also examined. The results indicated that compared to healthy controls, adults with aphasia were slower, less accurate and less likely to disregard the previous rule when switching from an old rule to a new rule. These deficits are representative of impaired reconfiguration control and interference in adults with aphasia. Predictable and unpredictable stimuli presentations influenced participants' performance to some extent. When a rule switch was not required, both groups demonstrated reduced switch costs and increased commission errors in the unpredictable condition. However, the lack of a predictability effect during rule-switching presented an overpowering demand for switching. Positive relationships among nonlinguistic switching measures and lack of relationships between linguistic and nonlinguistic switching implied two separate switching processes: linguistic and nonlinguistic. Strong ecological and construct validity of this study were also suggested. Further investigations on parsing linguistic and nonlinguistic processes for switching might broaden our understanding between cognitive representations and language. Continued efforts to recognize cognitive factors that may amplify communication deficits and integrate these cognitive processes with language components into therapy can be made.

ISBN: 9780549308164Subjects--Topical Terms:

1018105
Health Sciences, Speech Pathology.

Switching in adults with aphasia.
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100 1 $a Chiou, Hsin-Huei. $3 1266040
245 1 0 $a Switching in adults with aphasia.
300 $a 129 p.
500 $a Adviser: Mary R. T. Kennedy.
500 $a Source: Dissertation Abstracts International, Volume: 68-11, Section: B, page: 7296.
502 $a Thesis (Ph.D.)--University of Minnesota, 2007.
520 $a Previous research has demonstrated that adults with aphasia exhibited difficulties in switching (Kraat, 1990; Purdy, Duffy, & Coelho, 1994; Chiou & Kennedy, 2006). Switching is critical for cognitive flexibility which allows one to shift attention, ideas, sets and responses in a flexible manner (Rende, 2000). Switching requires regulation of processes of both current and previous tasks and the ability to resist interference from previous tasks (Rogers & Monsell, 1995). In this study, fourteen adults with mild or moderate aphasia (experimental group) and fourteen age- and education-matched healthy controls (control group) switched between go/no-go rules with minimized linguistic and cognitive demands. In order to investigate whether adults with aphasia would benefit from knowing what to expect next, both predictable (alternating between visual and auditory modalities) and unpredictable (visual and auditory modalities presented randomly) conditions were designed. Relationships between rule-switching and other executive function measures involving switching process were also examined. The results indicated that compared to healthy controls, adults with aphasia were slower, less accurate and less likely to disregard the previous rule when switching from an old rule to a new rule. These deficits are representative of impaired reconfiguration control and interference in adults with aphasia. Predictable and unpredictable stimuli presentations influenced participants' performance to some extent. When a rule switch was not required, both groups demonstrated reduced switch costs and increased commission errors in the unpredictable condition. However, the lack of a predictability effect during rule-switching presented an overpowering demand for switching. Positive relationships among nonlinguistic switching measures and lack of relationships between linguistic and nonlinguistic switching implied two separate switching processes: linguistic and nonlinguistic. Strong ecological and construct validity of this study were also suggested. Further investigations on parsing linguistic and nonlinguistic processes for switching might broaden our understanding between cognitive representations and language. Continued efforts to recognize cognitive factors that may amplify communication deficits and integrate these cognitive processes with language components into therapy can be made.
590 $a School code: 0130.
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710 2 $a University of Minnesota. $3 676231
773 0 $t Dissertation Abstracts International $g 68-11B.
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791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3287811