Does manipulating the speed of visual flow in virtual reality change distance estimation while walking in Parkinson's disease?
Identifieur interne : 000755 ( Main/Exploration ); précédent : 000754; suivant : 000756Does manipulating the speed of visual flow in virtual reality change distance estimation while walking in Parkinson's disease?
Auteurs : Kaylena A. Ehgoetz Martens [Canada] ; Colin G. Ellard ; Quincy J. AlmeidaSource :
- Experimental brain research [ 1432-1106 ] ; 2015.
English descriptors
- KwdEn :
- MESH :
- physiology : Distance Perception, Feedback, Sensory, Psychomotor Performance, Visual Perception, Walking.
- psychology : Parkinson Disease.
- Female, Humans, Male, User-Computer Interface.
Abstract
Although dopaminergic replacement therapy is believed to improve sensory processing in PD, while delayed perceptual speed is thought to be caused by a predominantly cholinergic deficit, it is unclear whether sensory-perceptual deficits are a result of corrupt sensory processing, or a delay in updating perceived feedback during movement. The current study aimed to examine these two hypotheses by manipulating visual flow speed and dopaminergic medication to examine which influenced distance estimation in PD. Fourteen PD and sixteen HC participants were instructed to estimate the distance of a remembered target by walking to the position the target formerly occupied. This task was completed in virtual reality in order to manipulate the visual flow (VF) speed in real time. Three conditions were carried out: (1) BASELINE: VF speed was equal to participants' real-time movement speed; (2) SLOW: VF speed was reduced by 50 %; (2) FAST: VF speed was increased by 30 %. Individuals with PD performed the experiment in their ON and OFF state. PD demonstrated significantly greater judgement error during BASELINE and FAST conditions compared to HC, although PD did not improve their judgement error during the SLOW condition. Additionally, PD had greater variable error during baseline compared to HC; however, during the SLOW conditions, PD had significantly less variable error compared to baseline and similar variable error to HC participants. Overall, dopaminergic medication did not significantly influence judgement error. Therefore, these results suggest that corrupt processing of sensory information is the main contributor to sensory-perceptual deficits during movement in PD rather than delayed updating of sensory feedback.
DOI: 10.1007/s00221-014-4154-z
PubMed: 25450453
Affiliations:
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Ehgoetz Martens</name><affiliation wicri:level="1"><nlm:affiliation>Sun Life Financial Movement Disorders Research and Rehabilitation Centre, Wilfrid Laurier University, 75 University Avenue West, Waterloo, ON, N2L 3C5, Canada.</nlm:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>Sun Life Financial Movement Disorders Research and Rehabilitation Centre, Wilfrid Laurier University, 75 University Avenue West, Waterloo, ON, N2L 3C5</wicri:regionArea><wicri:noRegion>N2L 3C5</wicri:noRegion></affiliation></author><author><name sortKey="Ellard, Colin G" sort="Ellard, Colin G" uniqKey="Ellard C" first="Colin G" last="Ellard">Colin G. Ellard</name></author><author><name sortKey="Almeida, Quincy J" sort="Almeida, Quincy J" uniqKey="Almeida Q" first="Quincy J" last="Almeida">Quincy J. Almeida</name></author></analytic><series><title level="j">Experimental brain research</title><idno type="eISSN">1432-1106</idno><imprint><date when="2015" type="published">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Distance Perception (physiology)</term><term>Feedback, Sensory (physiology)</term><term>Female</term><term>Humans</term><term>Male</term><term>Parkinson Disease (psychology)</term><term>Psychomotor Performance (physiology)</term><term>User-Computer Interface</term><term>Visual Perception (physiology)</term><term>Walking (physiology)</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Distance Perception</term><term>Feedback, Sensory</term><term>Psychomotor Performance</term><term>Visual Perception</term><term>Walking</term></keywords><keywords scheme="MESH" qualifier="psychology" xml:lang="en"><term>Parkinson Disease</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Female</term><term>Humans</term><term>Male</term><term>User-Computer Interface</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Although dopaminergic replacement therapy is believed to improve sensory processing in PD, while delayed perceptual speed is thought to be caused by a predominantly cholinergic deficit, it is unclear whether sensory-perceptual deficits are a result of corrupt sensory processing, or a delay in updating perceived feedback during movement. The current study aimed to examine these two hypotheses by manipulating visual flow speed and dopaminergic medication to examine which influenced distance estimation in PD. Fourteen PD and sixteen HC participants were instructed to estimate the distance of a remembered target by walking to the position the target formerly occupied. This task was completed in virtual reality in order to manipulate the visual flow (VF) speed in real time. Three conditions were carried out: (1) BASELINE: VF speed was equal to participants' real-time movement speed; (2) SLOW: VF speed was reduced by 50 %; (2) FAST: VF speed was increased by 30 %. Individuals with PD performed the experiment in their ON and OFF state. PD demonstrated significantly greater judgement error during BASELINE and FAST conditions compared to HC, although PD did not improve their judgement error during the SLOW condition. Additionally, PD had greater variable error during baseline compared to HC; however, during the SLOW conditions, PD had significantly less variable error compared to baseline and similar variable error to HC participants. Overall, dopaminergic medication did not significantly influence judgement error. Therefore, these results suggest that corrupt processing of sensory information is the main contributor to sensory-perceptual deficits during movement in PD rather than delayed updating of sensory feedback.</div></front></TEI><affiliations><list><country><li>Canada</li></country></list><tree><noCountry><name sortKey="Almeida, Quincy J" sort="Almeida, Quincy J" uniqKey="Almeida Q" first="Quincy J" last="Almeida">Quincy J. Almeida</name><name sortKey="Ellard, Colin G" sort="Ellard, Colin G" uniqKey="Ellard C" first="Colin G" last="Ellard">Colin G. Ellard</name></noCountry><country name="Canada"><noRegion><name sortKey="Ehgoetz Martens, Kaylena A" sort="Ehgoetz Martens, Kaylena A" uniqKey="Ehgoetz Martens K" first="Kaylena A" last="Ehgoetz Martens">Kaylena A. Ehgoetz Martens</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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