| Are non-relevant objects represented in working memory? The effect of non-target objects on reach and grasp kinematics. | |
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MedLine Citation:
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PMID: 7737398 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The role of visual information and the precise nature of the representations used in the control of prehension movements has frequently been studied by having subjects reach for target objects in the absence of visual information. Such manipulations have often been described as preventing visual feedback; however, they also impose a working memory load not found in prehension movements with normal vision. In this study we examined the relationship between working memory and visuospatial attention using a prehension task. In this study six healthy, right-handed adult subjects reached for a wooden block under conditions of normal vision, or else with their eyes closed having first observed the placement of the target. Furthermore, the role of visuospatial attention was examined by studying the effect, on transport and grasp kinematics, of placing task-irrelevant "flanker" objects (a wooden cylinder) within the visual field on a proportion of trials. Our results clearly demonstrated that the position of flankers produced clear interference effects on both transport and grasp kinematics. Furthermore, interference effects were significantly greater when subjects reached to the remembered location of the target (i.e., with eyes closed). The finding that the position of flanker objects influences both transport and grasp components of the prehension movement is taken as support for the view that these components may not be independently computed and that subjects may prepare a coordinated movement in which both transport and grasp are specifically adapted to the task in hand. The finding that flanker effects occur primarily when reaching to the remembered location of the target object is interpreted as supporting the view that attentional processes do not work efficiently on working memory representations. |
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Authors:
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S R Jackson; G M Jackson; J Rosicky |
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Publication Detail:
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Type: Clinical Trial; Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale Volume: 102 ISSN: 0014-4819 ISO Abbreviation: Exp Brain Res Publication Date: 1995 |
Date Detail:
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Created Date: 1995-06-06 Completed Date: 1995-06-06 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0043312 Medline TA: Exp Brain Res Country: GERMANY |
Other Details:
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Languages: eng Pagination: 519-30 Citation Subset: IM; S |
Affiliation:
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Human Movement Laboratory, Department of Psychology, University of Wales, Bangor, UK. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Arm / physiology Attention / physiology Deceleration Feedback / physiology Female Hand / physiology Humans Memory, Short-Term / physiology* Middle Aged Movement / physiology* Photic Stimulation Space Perception / physiology Videotape Recording |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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