2.50
Hdl Handle:
http://hdl.handle.net/10545/304846
Title:
Dynamic transformation of vestibular signals for orientation
Authors:
Osler, Callum J.; Reynolds, Raymond Francis
Abstract:
The same pattern of vestibular afferent feedback may signify a loss of balance or a change in body orientation, depending upon the initial head posture. To resolve this ambiguity and generate an appropriate motor response, the CNS must transform vestibular information from a head-centred reference frame into relevant motor coordinates. But what if the reference frame is continuously moving? Here, we ask if this neural transformation process is continuously updated during a voluntary change in head posture. Galvanic vestibular stimulation (GVS) was used to induce a sensation of head roll motion in blindfolded subjects marching on the spot. When head orientation was fixed, this caused unconscious turning behaviour that was maximal during neck flexion, minimal with the head level and reversed direction with neck extension. Subjects were then asked to produce a continuous voluntary change in head pitch, while GVS was applied. As the neck moved from full flexion into extension, turn velocity was continuously modulated and even reversed direction, reflecting the pattern observed during the head-fixed condition. Hence, an identical vestibular input resulted in motor output which was dynamically modulated by changes in head pitch. However, response magnitude was significantly reduced, suggesting possible suppression of vestibular input during voluntary head movement. Nevertheless, these results show that the CNS continuously reinterprets vestibular exafference to account for ongoing voluntary changes in head posture. This may explain why the head can be moved freely without losing the sense of balance and orientation.
Affiliation:
University of Birmingham, School of Sport and Exercise Sciences, College of Life and Environmental Sciences
Citation:
Dynamic transformation of vestibular signals for orientation 2012, 223 (2):189 Experimental Brain Research
Publisher:
Springer
Journal:
Experimental Brain Research
Issue Date:
2012
URI:
http://hdl.handle.net/10545/304846
DOI:
10.1007/s00221-012-3250-1
Additional Links:
http://link.springer.com/10.1007/s00221-012-3250-1
Type:
Research Report
Language:
en
ISSN:
0014-4819; 1432-1106
Appears in Collections:
Biological Sciences Research Group

Full metadata record

DC FieldValue Language
dc.contributor.authorOsler, Callum J.en
dc.contributor.authorReynolds, Raymond Francisen
dc.date.accessioned2013-10-31T18:53:47Z-
dc.date.available2013-10-31T18:53:47Z-
dc.date.issued2012-
dc.identifier.citationDynamic transformation of vestibular signals for orientation 2012, 223 (2):189 Experimental Brain Researchen
dc.identifier.issn0014-4819-
dc.identifier.issn1432-1106-
dc.identifier.doi10.1007/s00221-012-3250-1-
dc.identifier.urihttp://hdl.handle.net/10545/304846-
dc.description.abstractThe same pattern of vestibular afferent feedback may signify a loss of balance or a change in body orientation, depending upon the initial head posture. To resolve this ambiguity and generate an appropriate motor response, the CNS must transform vestibular information from a head-centred reference frame into relevant motor coordinates. But what if the reference frame is continuously moving? Here, we ask if this neural transformation process is continuously updated during a voluntary change in head posture. Galvanic vestibular stimulation (GVS) was used to induce a sensation of head roll motion in blindfolded subjects marching on the spot. When head orientation was fixed, this caused unconscious turning behaviour that was maximal during neck flexion, minimal with the head level and reversed direction with neck extension. Subjects were then asked to produce a continuous voluntary change in head pitch, while GVS was applied. As the neck moved from full flexion into extension, turn velocity was continuously modulated and even reversed direction, reflecting the pattern observed during the head-fixed condition. Hence, an identical vestibular input resulted in motor output which was dynamically modulated by changes in head pitch. However, response magnitude was significantly reduced, suggesting possible suppression of vestibular input during voluntary head movement. Nevertheless, these results show that the CNS continuously reinterprets vestibular exafference to account for ongoing voluntary changes in head posture. This may explain why the head can be moved freely without losing the sense of balance and orientation.en
dc.language.isoenen
dc.publisherSpringeren
dc.relation.urlhttp://link.springer.com/10.1007/s00221-012-3250-1en
dc.rightsArchived with thanks to Experimental Brain Researchen
dc.subjectVestibularen
dc.subjectLocomotionen
dc.subjectGalvanic vestibular stimulationen
dc.subjectVoluntary movementen
dc.subjectOrientationen
dc.titleDynamic transformation of vestibular signals for orientationen
dc.typeResearch Reporten
dc.contributor.departmentUniversity of Birmingham, School of Sport and Exercise Sciences, College of Life and Environmental Sciencesen
dc.identifier.journalExperimental Brain Researchen
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