| The many roles of vision during walking. | |
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MedLine Citation:
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PMID: 20852990 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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Vision can improve bipedal upright stability during standing and locomotion. However, during locomotion, vision supports additional behaviors such as gait cycle modulation, navigation, and obstacle avoidance. Here, we investigate how the multiple roles of vision are reflected in the dynamics of trunk control as the neural control problem changes from a fixed to a moving base of support. Subjects were presented with either low- or high-amplitude broadband visual stimuli during standing posture or while walking on a treadmill at 1 km/h and 5 km/h. Frequency response functions between visual scene motion (input) and trunk kinematics (output) revealed little or no change in the gain of trunk orientation in the standing posture and walking conditions. However, a dramatic increase in gain was observed in trunk (hip and shoulder) horizontal displacement from posture to locomotion. Such increases in gain may be interpreted as an increased coupling to visual scene motion. However, we believe that the increased gain reflects a decrease in stability due to a change of the control problem from standing to locomotion. Indeed, keeping the body upright with the use of vision during walking is complicated by the additional locomotor processes at work. Unlike during standing, vision plays many roles during locomotion, providing information for upright stability as well as body position relative to the external environment. |
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Authors:
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David Logan; Tim Kiemel; Nadia Dominici; Germana Cappellini; Yuri Ivanenko; Francesco Lacquaniti; John J Jeka |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2010-09-18 |
Journal Detail:
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Title: Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale Volume: 206 ISSN: 1432-1106 ISO Abbreviation: Exp Brain Res Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-09-22 Completed Date: - Revised Date: - |
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: 337-50 Citation Subset: IM |
Affiliation:
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Department of Kinesiology, University of Maryland, College Park, MD 20742-2611, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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