Neural substrates of knowledge of hand postures for object grasping and functional object use: evidence from fMRI.

Neural substrates of knowledge of hand postures for object grasping and functional object use: evidence from fMRI. Research Abstract Details 

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Neural substrates of knowledge of hand postures for object grasping and functional object use: evidence from fMRI. Abstract Text:

Laurel J Buxbaum,Kathleen M Kyle,Kathy Tang,John A Detre,

A number of lines of evidence suggest that computation of hand posture differs for object grasping as compared to functional object use. Hand shaping for grasping appears to rely strongly upon calculations of current object location and volume, whereas hand shaping for object use additionally requires access to stored knowledge about the skilled manipulation specific to a given object. In addition, the particular hand postures employed for functional object use may be either prehensile (clenching, pinching) or non-prehensile (e.g., palming, poking), in contrast to the prehensile postures that are obligatory for grasping. In this fMRI study, we assessed the hypothesis that a left-hemisphere-lateralized system including the inferior parietal lobe is specifically recruited for the computation and recognition of hand postures for functional object use. Fifteen subjects viewed pictures of manipulable objects and determined whether they would be grasped with a pinch or clench (Grasp condition), functionally used with a pinch or clench (Prehensile Use condition), or functionally used with a palm or poke hand posture (Non-prehensile Use condition). Despite the fact that the conditions were equated for behavioral difficulty, significantly greater activations were observed in the left inferior frontal gyrus (IFG), posterior superior temporal gyrus (STG), and inferior parietal lobule (IPL) in Non-prehensile Use trials as compared to Grasp trials. Comparison of Non-prehensile Use and Prehensile Use activations revealed significant differences only in the left IPL. These data confirm the importance of the left IPL in storing knowledge of hand postures for functional object use, and have implications for understanding the interaction of dorsal and ventral visual processing systems.

Neural substrates of knowledge of hand postures for object grasping and functional object use: evidence from fMRI. Publishing Authors By Initials

LJ Buxbaum,KM Kyle,K Tang,JA Detre,

For similar nervous system: neural pathways: afferent pathways: visual pathways research abstracts see: nervous system: neural pathways: afferent pathways: visual pathways research

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Neural substrates of knowledge of hand postures for object grasping and functional object use: evidence from fMRI. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Brain research

VOLUME: 1117

Page Numbers: 175-85

Journal Abbreviation: Brain Res.

ISSN: 0006-8993

DAY: 7

MONTH: 09

YEAR: 2006

Neural substrates of knowledge of hand postures for object grasping and functional object use: evidence from fMRI. Information

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LANGUAGE: eng

NlmUniqueID: 45503

Neural substrates of knowledge of hand postures for object grasping and functional object use: evidence from fMRI. Keywords Mesh Terms:

KEYWORDS: Visual Pathways

MESH TERMS: physiology

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Grant and Affiliation Information for Neural substrates of knowledge of hand postures for object grasping and functional object use: evidence from fMRI.

AFFILIATION: Moss Rehabilitation Research Institute, Korman 213, 1200 W. Tabor Road, Philadelphia, PA 19141, USA.

Country: Netherlands

AGENCY: United States NINDS

GRANT: R01-NS36387

ACRONYM: NS

MEDLINETA: Brain Res

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