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Constraints on perception of information from obstacles during foot clearance in people with chronic stroke

Content Provider	Springer Nature Link
Author	Shafizadeh, Mohsen Wheat, Jonathan Davids, Keith Ansari, ureddin Nakhostin Ali, Ali Garmabi, Samira
Copyright Year	2017
Abstract	The aim of this study was to examine effects of different types of task constraints on coupling of perception and action in people with chronic stroke when crossing obstacles during a walking task. Ten participants with hemiplegic chronic stroke volunteered to walk over a static obstacle under two distinct task constraints: simple and dual tasks. Under simple task constraints, without specific instructions, participants walked at their preferred speed and crossed over an obstacle. Under dual task constraints, the same individuals were required to subtract numbers whilst walking. Under both distinct task constraints, we examined emergent values of foot distance when clearing a static obstacle in both affected and unaffected legs, measured by a 3D motion tracking system. Principal component analysis was used to quantify task performance, and discriminant analysis was used to compare gait performance between task constraints. Results suggested that patients, regardless of affected body side, demonstrated differences in perception of distance information from the obstacle, which constrained gait differences in initial swing, mid-swing, and crossing phases. Furthermore, dual task constraints, rather than hemiplegic body side, were a significant discriminator in patients’ perceptions of distance and height information to the obstacle. These findings suggested how performance of additional cognitive tasks might constrain perception of information from an obstacle in people with chronic stroke during different phases of obstacle crossing, and thus may impair their adaptive ability to successfully manoeuvre around objects.
Starting Page	1665
Ending Page	1676
Page Count	12
File Format	PDF
ISSN	00144819
Journal	Experimental Brain Research
Volume Number	235
Issue Number	6
e-ISSN	14321106
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-03-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gait Perception Cognitive task constraints Obstacle crossing Stroke Neurosciences Neurology
Content Type	Text
Resource Type	Article
Subject	Neuroscience

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