| Two classes of movements in motor control. | |
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MedLine Citation:
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PMID: 22038712 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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This work investigated whether fundamental differences emerged between segments of complex movement sequences performed at different instructed speeds. To this end, we tested 5 novices and 1 karate expert as they performed beginner's martial arts routines. We found that if one blindly took these segments and separated them according to the variability of trajectory parameters, one could unambiguously group two classes of movements between the same two space regions: one type that remained quite conserved despite speed changes and another type that changed with speed level. These groups corresponded to functionally different movements (strike segments explicitly directed to a set of goals and spontaneously retracting segments supplementing the goals). The curvature of the goal-directed segments remained quite conserved despite speed changes, yet the supplemental movements spanned families of trajectories with different curvature according to the speed. Likewise, the values of the hand's peak velocity across trials were more variable in supplemental segments, and for each participant, there were different statistical signatures of variability between the two movement classes. This dichotomy between coexisting movement classes of our natural actions calls for a theoretical characterization. The present experimental results strongly suggest that two separate sets of principles may govern these movement classes in complex natural behaviors, since under different dynamics the hand did not describe a unique family of trajectories between the same two points in the 3D space. |
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Authors:
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Elizabeth B Torres |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-10-29 |
Journal Detail:
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Title: Experimental brain research. Experimentelle Hirnforschung. Experimentation cerebrale Volume: - ISSN: 1432-1106 ISO Abbreviation: - Publication Date: 2011 Oct |
Date Detail:
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Created Date: 2011-10-31 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0043312 Medline TA: Exp Brain Res Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Psychology Department (Busch Campus), Rutgers University, 152 Frelinghuysen Rd, Piscataway, NJ, 08854, USA, ebtorres@rci.rutgers.edu. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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