Analysis of accuracy in pointing with redundant hand-held tools: a geometric approach to the uncontrolled manifold method.

This work introduces a coordinate-independent method to analyse movement variability of tasks performed with hand-held tools, such as a pen or a surgical scalpel. We extend the classical uncontrolled manifold (UCM) approach by exploiting the geometry of rigid body motions, used to describe tool conf...

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Autores principales:	Domenico Campolo, Ferdinan Widjaja, Hong Xu, Wei Tech Ang, Etienne Burdet
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Biology (General) QH301-705.5
Acceso en línea:	https://doaj.org/article/a971508ce9fe40ccb2d8825c6b891e50
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spelling	oai:doaj.org-article:a971508ce9fe40ccb2d8825c6b891e502021-11-18T05:52:15ZAnalysis of accuracy in pointing with redundant hand-held tools: a geometric approach to the uncontrolled manifold method.1553-734X1553-735810.1371/journal.pcbi.1002978https://doaj.org/article/a971508ce9fe40ccb2d8825c6b891e502013-04-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23592956/pdf/?tool=EBIhttps://doaj.org/toc/1553-734Xhttps://doaj.org/toc/1553-7358This work introduces a coordinate-independent method to analyse movement variability of tasks performed with hand-held tools, such as a pen or a surgical scalpel. We extend the classical uncontrolled manifold (UCM) approach by exploiting the geometry of rigid body motions, used to describe tool configurations. In particular, we analyse variability during a static pointing task with a hand-held tool, where subjects are asked to keep the tool tip in steady contact with another object. In this case the tool is redundant with respect to the task, as subjects control position/orientation of the tool, i.e. 6 degrees-of-freedom (dof), to maintain the tool tip position (3dof) steady. To test the new method, subjects performed a pointing task with and without arm support. The additional dof introduced in the unsupported condition, injecting more variability into the system, represented a resource to minimise variability in the task space via coordinated motion. The results show that all of the seven subjects channeled more variability along directions not directly affecting the task (UCM), consistent with previous literature but now shown in a coordinate-independent way. Variability in the unsupported condition was only slightly larger at the endpoint but much larger in the UCM.Domenico CampoloFerdinan WidjajaHong XuWei Tech AngEtienne BurdetPublic Library of Science (PLoS)articleBiology (General)QH301-705.5ENPLoS Computational Biology, Vol 9, Iss 4, p e1002978 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Biology (General) QH301-705.5
spellingShingle	Biology (General) QH301-705.5 Domenico Campolo Ferdinan Widjaja Hong Xu Wei Tech Ang Etienne Burdet Analysis of accuracy in pointing with redundant hand-held tools: a geometric approach to the uncontrolled manifold method.
description	This work introduces a coordinate-independent method to analyse movement variability of tasks performed with hand-held tools, such as a pen or a surgical scalpel. We extend the classical uncontrolled manifold (UCM) approach by exploiting the geometry of rigid body motions, used to describe tool configurations. In particular, we analyse variability during a static pointing task with a hand-held tool, where subjects are asked to keep the tool tip in steady contact with another object. In this case the tool is redundant with respect to the task, as subjects control position/orientation of the tool, i.e. 6 degrees-of-freedom (dof), to maintain the tool tip position (3dof) steady. To test the new method, subjects performed a pointing task with and without arm support. The additional dof introduced in the unsupported condition, injecting more variability into the system, represented a resource to minimise variability in the task space via coordinated motion. The results show that all of the seven subjects channeled more variability along directions not directly affecting the task (UCM), consistent with previous literature but now shown in a coordinate-independent way. Variability in the unsupported condition was only slightly larger at the endpoint but much larger in the UCM.
format	article
author	Domenico Campolo Ferdinan Widjaja Hong Xu Wei Tech Ang Etienne Burdet
author_facet	Domenico Campolo Ferdinan Widjaja Hong Xu Wei Tech Ang Etienne Burdet
author_sort	Domenico Campolo
title	Analysis of accuracy in pointing with redundant hand-held tools: a geometric approach to the uncontrolled manifold method.
title_short	Analysis of accuracy in pointing with redundant hand-held tools: a geometric approach to the uncontrolled manifold method.
title_full	Analysis of accuracy in pointing with redundant hand-held tools: a geometric approach to the uncontrolled manifold method.
title_fullStr	Analysis of accuracy in pointing with redundant hand-held tools: a geometric approach to the uncontrolled manifold method.
title_full_unstemmed	Analysis of accuracy in pointing with redundant hand-held tools: a geometric approach to the uncontrolled manifold method.
title_sort	analysis of accuracy in pointing with redundant hand-held tools: a geometric approach to the uncontrolled manifold method.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/a971508ce9fe40ccb2d8825c6b891e50
work_keys_str_mv	AT domenicocampolo analysisofaccuracyinpointingwithredundanthandheldtoolsageometricapproachtotheuncontrolledmanifoldmethod AT ferdinanwidjaja analysisofaccuracyinpointingwithredundanthandheldtoolsageometricapproachtotheuncontrolledmanifoldmethod AT hongxu analysisofaccuracyinpointingwithredundanthandheldtoolsageometricapproachtotheuncontrolledmanifoldmethod AT weitechang analysisofaccuracyinpointingwithredundanthandheldtoolsageometricapproachtotheuncontrolledmanifoldmethod AT etienneburdet analysisofaccuracyinpointingwithredundanthandheldtoolsageometricapproachtotheuncontrolledmanifoldmethod
_version_	1718424747455283200

Analysis of accuracy in pointing with redundant hand-held tools: a geometric approach to the uncontrolled manifold method.

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