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Hand preshaping patterns during reac...

Schettino, Luis Felipe.

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Hand preshaping patterns during reach-to-grasp movements in normal controls and Parkinson's disease patients.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Hand preshaping patterns during reach-to-grasp movements in normal controls and Parkinson's disease patients./
作者:	Schettino, Luis Felipe.
面頁冊數:	296 p.
附註:	Director: Howard Poizner.
Contained By:	Dissertation Abstracts International63-02B.
標題:	Biology, Neuroscience. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3043622
ISBN:	0493575030

Hand preshaping patterns during reach-to-grasp movements in normal controls and Parkinson's disease patients.
Schettino, Luis Felipe.

Hand preshaping patterns during reach-to-grasp movements in normal controls and Parkinson's disease patients. - 296 p.

Director: Howard Poizner.

Thesis (Ph.D.)--Rutgers The State University of New Jersey - Newark, 2002.

The present thesis comprises a series of experimental studies regarding the process of hand preshaping during prehension movements in normal adults and Parkinson's disease patients. The reach-to-grasp movement is thought to consist of two parallel, semi-independent visuomotor channels: a reach or transport component and a grasp or <italic>prehension</italic> component. While the transport component depends on the extrinsic characteristics of the target object, such as size, the prehension component depends on its intrinsic characteristics, such as shape (Jeannerod, 1981). Handshape evolution during the reach-to-grasp movement is a continuous process involving the transformation of the sensory information regarding object shape into predictive motor commands controlling hand configuration. Novel kinematic analysis techniques were used in order to quantify arm, wrist and finger joint trajectories during prehension movements performed towards objects of different shapes. Subsequently, multivariate statistical techniques were employed to determine the differential evolution of hand configuration in grasps performed to different objects.

ISBN: 0493575030Subjects--Topical Terms:

1017680
Biology, Neuroscience.

Hand preshaping patterns during reach-to-grasp movements in normal controls and Parkinson's disease patients.
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100 1 $a Schettino, Luis Felipe. $3 1255026
245 1 0 $a Hand preshaping patterns during reach-to-grasp movements in normal controls and Parkinson's disease patients.
300 $a 296 p.
500 $a Director: Howard Poizner.
500 $a Source: Dissertation Abstracts International, Volume: 63-02, Section: B, page: 0686.
502 $a Thesis (Ph.D.)--Rutgers The State University of New Jersey - Newark, 2002.
520 $a The present thesis comprises a series of experimental studies regarding the process of hand preshaping during prehension movements in normal adults and Parkinson's disease patients. The reach-to-grasp movement is thought to consist of two parallel, semi-independent visuomotor channels: a reach or transport component and a grasp or <italic>prehension</italic> component. While the transport component depends on the extrinsic characteristics of the target object, such as size, the prehension component depends on its intrinsic characteristics, such as shape (Jeannerod, 1981). Handshape evolution during the reach-to-grasp movement is a continuous process involving the transformation of the sensory information regarding object shape into predictive motor commands controlling hand configuration. Novel kinematic analysis techniques were used in order to quantify arm, wrist and finger joint trajectories during prehension movements performed towards objects of different shapes. Subsequently, multivariate statistical techniques were employed to determine the differential evolution of hand configuration in grasps performed to different objects.
520 $a Our results indicate that target shape affects hand preshaping at an early stage during the movement (grip selection) and that, when available, normal subjects employ visual feedback in order to achieve more efficient grasps (grip modulation). Moreover, we have found evidence that the transport phase of the movement is necessary for the coordination of hand configuration.
520 $a Our studies on the reach-to-grasp movement of parkinsonian subjects have indicated that PD subjects exhibit deficits in the use of predictive control. This result suggests that PD patients may be deficient in their ability to integrate visual and somatosensory information. Moreover, PD subjects were found to rely excessively on visual feedback for the control of hand preshaping. Finally, our studies indicate that while anti-parkinsonian medications improve some kinematic parameters in PD subjects such as the peak velocity of grasping movements, they do not remediate hand preshaping deficits regardless of visual feedback availability.
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