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Balance control in reaching tasks: E...

Streepey, Jefferson William.

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Balance control in reaching tasks: Effects of development and somatosensory feedback.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Balance control in reaching tasks: Effects of development and somatosensory feedback./
Author:	Streepey, Jefferson William.
Description:	194 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4271.
Contained By:	Dissertation Abstracts International64-09B.
Subject:	Health Sciences, Human Development. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3106170
ISBN:	0496537369

Balance control in reaching tasks: Effects of development and somatosensory feedback.
Streepey, Jefferson William.

Balance control in reaching tasks: Effects of development and somatosensory feedback. - 194 p.

Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4271.

Thesis (Ph.D.)--University of Michigan, 2003.

Balance control is a fundamental component in the success of reaching tasks. A proposed model suggests that movement experience enhances the prediction of sensory feedback encountered during reaching. This enhanced prediction improves balance control through a two-phase process where a phase of rapid acquisition of balance control precedes a phase of fine-tuning. In the model, this process is not age locked but rather experience and task difficulty dependent. To examine this model, younger children, older children, and adults performed reach holds and reach reversals to arm's length and maximum target distances. Somatosensory feedback was altered by having subjects stand on hard, knobby, and foam surfaces. Balance control was assessed through measures of center of pressure (COP), center of mass (COM), and the relationship between the COP and COM in the anterior-posterior (AP) and medial-lateral (ML) directions. Compared to adults, gross indicators of AP balance control, such as COP excursion (COPE), demonstrated less effective balance control in younger children [p < 0.001]. As a result of increased task difficulty, only those indicators of finely tuned AP balance control, such as COP amplitude, revealed less effective balance control in older children compared to adults [p < 0.001]. ML balance control, indicated by ML COPE, was less effective in the youngest children compared to adults even for easier tasks [p < 0.001]. ML COPE was also decreased in older children but only as a result of the combined effect of reaching task and somatosensory manipulations [p < 0.001]. These results suggest that gross balance control in the direction of reaching (AP direction) develops rapidly in children because differences between the older children and adults existed only for measures of fine-tuning. Differences in ML balance control between older children and adults indicated by ML COPE suggested that balance control developed more slowly in the direction perpendicular to reaching. It is argued that movement experience contributes to the building of an internal representation of the body. Through the construction of this internal representation, gross balance control is first achieved and balance control is refined as the planning of balance control and prediction of sensory feedback improves.

ISBN: 0496537369Subjects--Topical Terms:

1019218
Health Sciences, Human Development.

Balance control in reaching tasks: Effects of development and somatosensory feedback.
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100 1 $a Streepey, Jefferson William. $3 1931274
245 1 0 $a Balance control in reaching tasks: Effects of development and somatosensory feedback.
300 $a 194 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4271.
500 $a Chair: Rosa M. Angulo-Barroso.
502 $a Thesis (Ph.D.)--University of Michigan, 2003.
520 $a Balance control is a fundamental component in the success of reaching tasks. A proposed model suggests that movement experience enhances the prediction of sensory feedback encountered during reaching. This enhanced prediction improves balance control through a two-phase process where a phase of rapid acquisition of balance control precedes a phase of fine-tuning. In the model, this process is not age locked but rather experience and task difficulty dependent. To examine this model, younger children, older children, and adults performed reach holds and reach reversals to arm's length and maximum target distances. Somatosensory feedback was altered by having subjects stand on hard, knobby, and foam surfaces. Balance control was assessed through measures of center of pressure (COP), center of mass (COM), and the relationship between the COP and COM in the anterior-posterior (AP) and medial-lateral (ML) directions. Compared to adults, gross indicators of AP balance control, such as COP excursion (COPE), demonstrated less effective balance control in younger children [p < 0.001]. As a result of increased task difficulty, only those indicators of finely tuned AP balance control, such as COP amplitude, revealed less effective balance control in older children compared to adults [p < 0.001]. ML balance control, indicated by ML COPE, was less effective in the youngest children compared to adults even for easier tasks [p < 0.001]. ML COPE was also decreased in older children but only as a result of the combined effect of reaching task and somatosensory manipulations [p < 0.001]. These results suggest that gross balance control in the direction of reaching (AP direction) develops rapidly in children because differences between the older children and adults existed only for measures of fine-tuning. Differences in ML balance control between older children and adults indicated by ML COPE suggested that balance control developed more slowly in the direction perpendicular to reaching. It is argued that movement experience contributes to the building of an internal representation of the body. Through the construction of this internal representation, gross balance control is first achieved and balance control is refined as the planning of balance control and prediction of sensory feedback improves.
590 $a School code: 0127.
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856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3106170