Precision and accuracy of the subjective haptic vertical in the roll plane
Identifieur interne : 001619 ( Ncbi/Merge ); précédent : 001618; suivant : 001620Precision and accuracy of the subjective haptic vertical in the roll plane
Auteurs : Jeanine R. Schuler [Suisse] ; Christopher J. Bockisch [Suisse] ; Dominik Straumann [Suisse] ; Alexander A. Tarnutzer [Suisse]Source :
- BMC Neuroscience [ 1471-2202 ] ; 2010.
English descriptors
- KwdEn :
- MESH :
- physiology : Head Movements, Orientation, Posture, Space Perception, Visual Perception.
- Adult, Analysis of Variance, Cues, Female, Humans, Male, Rotation.
Abstract
When roll-tilted, the subjective visual vertical (SVV) deviates up to 40° from earth-vertical and trial-to-trial variability increases with head roll. Imperfections in the central processing of visual information were postulated to explain these roll-angle dependent errors. For experimental conditions devoid of visual input, e.g. adjustments of body posture or of an object along vertical in darkness, significantly smaller errors were noted. Whereas the accuracy of verticality adjustments seems to depend strongly on the paradigm, we hypothesize that the precision, i.e. the inverse of trial-to-trial variability, is less influenced by the experimental setup and mainly reflects properties of the otoliths. Here we measured the subjective haptic vertical (SHV) and compared findings with previously reported SVV data. Twelve healthy right-handed human subjects (handedness assessed based on subjects' verbal report) adjusted a rod with the right hand along perceived earth-vertical during static head roll-tilts (0-360°, steps of 20°).
SHV adjustments showed a tendency for clockwise rod rotations to deviate counter-clockwise and for counter-clockwise rod rotations to deviate clockwise, indicating hysteresis. Clockwise rod rotations resulted in counter-clockwise shifts of perceived earth-vertical up to -11.7° and an average counter-clockwise SHV shift over all roll angles of -3.3° (± 11.0°; ± 1 StdDev). Counter-clockwise rod rotations yielded peak SHV deviations in clockwise direction of 8.9° and an average clockwise SHV shift over all roll angles of 1.8° (± 11.1°). Trial-to-trial variability was minimal in upright position, increased with increasing roll (peaking around 120-140°) and decreased to intermediate values in upside-down orientation. Compared to SVV, SHV variability near upright and upside-down was non-significantly (p > 0.05) larger; both showed an m-shaped pattern of variability as a function of roll position.
The reduction of adjustment errors by eliminating visual input supports the notion that deviations between perceived and actual earth-vertical in roll-tilted positions arise from central processing of visual information. The shared roll-tilt dependent modulation of trial-to-trial variability for both SVV and SHV, on the other hand, indicates that the perception of earth-verticality is dominated by the same sensory signal, i.e. the otolith signal, independent of whether the line/rod setting is under visual or tactile control.
Url:
DOI: 10.1186/1471-2202-11-83
PubMed: 20630097
PubMed Central: 2912915
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<front><div type="abstract" xml:lang="en"><sec><title>Background</title>
<p>When roll-tilted, the subjective visual vertical (SVV) deviates up to 40° from earth-vertical and trial-to-trial variability increases with head roll. Imperfections in the central processing of visual information were postulated to explain these roll-angle dependent errors. For experimental conditions devoid of visual input, e.g. adjustments of body posture or of an object along vertical in darkness, significantly smaller errors were noted. Whereas the accuracy of verticality adjustments seems to depend strongly on the paradigm, we hypothesize that the precision, i.e. the inverse of trial-to-trial variability, is less influenced by the experimental setup and mainly reflects properties of the otoliths. Here we measured the subjective haptic vertical (SHV) and compared findings with previously reported SVV data. Twelve healthy right-handed human subjects (handedness assessed based on subjects' verbal report) adjusted a rod with the right hand along perceived earth-vertical during static head roll-tilts (0-360°, steps of 20°).</p>
</sec>
<sec><title>Results</title>
<p>SHV adjustments showed a tendency for clockwise rod rotations to deviate counter-clockwise and for counter-clockwise rod rotations to deviate clockwise, indicating hysteresis. Clockwise rod rotations resulted in counter-clockwise shifts of perceived earth-vertical up to -11.7° and an average counter-clockwise SHV shift over all roll angles of -3.3° (± 11.0°; ± 1 StdDev). Counter-clockwise rod rotations yielded peak SHV deviations in clockwise direction of 8.9° and an average clockwise SHV shift over all roll angles of 1.8° (± 11.1°). Trial-to-trial variability was minimal in upright position, increased with increasing roll (peaking around 120-140°) and decreased to intermediate values in upside-down orientation. Compared to SVV, SHV variability near upright and upside-down was non-significantly (p > 0.05) larger; both showed an m-shaped pattern of variability as a function of roll position.</p>
</sec>
<sec><title>Conclusions</title>
<p>The reduction of adjustment errors by eliminating visual input supports the notion that deviations between perceived and actual earth-vertical in roll-tilted positions arise from central processing of visual information. The shared roll-tilt dependent modulation of trial-to-trial variability for both SVV and SHV, on the other hand, indicates that the perception of earth-verticality is dominated by the same sensory signal, i.e. the otolith signal, independent of whether the line/rod setting is under visual or tactile control.</p>
</sec>
</div>
</front>
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</TEI>
<double pmid="20630097"><pmc><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Precision and accuracy of the subjective haptic vertical in the roll plane</title>
<author><name sortKey="Schuler, Jeanine R" sort="Schuler, Jeanine R" uniqKey="Schuler J" first="Jeanine R" last="Schuler">Jeanine R. Schuler</name>
<affiliation wicri:level="1"><nlm:aff id="I1">Department of Neurology, Zurich University Hospital, Zurich, Switzerland</nlm:aff>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Department of Neurology, Zurich University Hospital, Zurich</wicri:regionArea>
<wicri:noRegion>Zurich</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Bockisch, Christopher J" sort="Bockisch, Christopher J" uniqKey="Bockisch C" first="Christopher J" last="Bockisch">Christopher J. Bockisch</name>
<affiliation wicri:level="1"><nlm:aff id="I1">Department of Neurology, Zurich University Hospital, Zurich, Switzerland</nlm:aff>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Department of Neurology, Zurich University Hospital, Zurich</wicri:regionArea>
<wicri:noRegion>Zurich</wicri:noRegion>
</affiliation>
<affiliation wicri:level="1"><nlm:aff id="I2">Department of Otorhinolaryngology, Zurich University Hospital, Zurich, Switzerland</nlm:aff>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Department of Otorhinolaryngology, Zurich University Hospital, Zurich</wicri:regionArea>
<wicri:noRegion>Zurich</wicri:noRegion>
</affiliation>
<affiliation wicri:level="1"><nlm:aff id="I3">Department of Ophthalmology, Zurich University Hospital, Zurich, Switzerland</nlm:aff>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Department of Ophthalmology, Zurich University Hospital, Zurich</wicri:regionArea>
<wicri:noRegion>Zurich</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Straumann, Dominik" sort="Straumann, Dominik" uniqKey="Straumann D" first="Dominik" last="Straumann">Dominik Straumann</name>
<affiliation wicri:level="1"><nlm:aff id="I1">Department of Neurology, Zurich University Hospital, Zurich, Switzerland</nlm:aff>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Department of Neurology, Zurich University Hospital, Zurich</wicri:regionArea>
<wicri:noRegion>Zurich</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Tarnutzer, Alexander A" sort="Tarnutzer, Alexander A" uniqKey="Tarnutzer A" first="Alexander A" last="Tarnutzer">Alexander A. Tarnutzer</name>
<affiliation wicri:level="1"><nlm:aff id="I1">Department of Neurology, Zurich University Hospital, Zurich, Switzerland</nlm:aff>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Department of Neurology, Zurich University Hospital, Zurich</wicri:regionArea>
<wicri:noRegion>Zurich</wicri:noRegion>
</affiliation>
</author>
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<publicationStmt><idno type="wicri:source">PMC</idno>
<idno type="pmid">20630097</idno>
<idno type="pmc">2912915</idno>
<idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2912915</idno>
<idno type="RBID">PMC:2912915</idno>
<idno type="doi">10.1186/1471-2202-11-83</idno>
<date when="2010">2010</date>
<idno type="wicri:Area/Pmc/Corpus">001B87</idno>
<idno type="wicri:Area/Pmc/Curation">001B87</idno>
<idno type="wicri:Area/Pmc/Checkpoint">001D90</idno>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Precision and accuracy of the subjective haptic vertical in the roll plane</title>
<author><name sortKey="Schuler, Jeanine R" sort="Schuler, Jeanine R" uniqKey="Schuler J" first="Jeanine R" last="Schuler">Jeanine R. Schuler</name>
<affiliation wicri:level="1"><nlm:aff id="I1">Department of Neurology, Zurich University Hospital, Zurich, Switzerland</nlm:aff>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Department of Neurology, Zurich University Hospital, Zurich</wicri:regionArea>
<wicri:noRegion>Zurich</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Bockisch, Christopher J" sort="Bockisch, Christopher J" uniqKey="Bockisch C" first="Christopher J" last="Bockisch">Christopher J. Bockisch</name>
<affiliation wicri:level="1"><nlm:aff id="I1">Department of Neurology, Zurich University Hospital, Zurich, Switzerland</nlm:aff>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Department of Neurology, Zurich University Hospital, Zurich</wicri:regionArea>
<wicri:noRegion>Zurich</wicri:noRegion>
</affiliation>
<affiliation wicri:level="1"><nlm:aff id="I2">Department of Otorhinolaryngology, Zurich University Hospital, Zurich, Switzerland</nlm:aff>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Department of Otorhinolaryngology, Zurich University Hospital, Zurich</wicri:regionArea>
<wicri:noRegion>Zurich</wicri:noRegion>
</affiliation>
<affiliation wicri:level="1"><nlm:aff id="I3">Department of Ophthalmology, Zurich University Hospital, Zurich, Switzerland</nlm:aff>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Department of Ophthalmology, Zurich University Hospital, Zurich</wicri:regionArea>
<wicri:noRegion>Zurich</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Straumann, Dominik" sort="Straumann, Dominik" uniqKey="Straumann D" first="Dominik" last="Straumann">Dominik Straumann</name>
<affiliation wicri:level="1"><nlm:aff id="I1">Department of Neurology, Zurich University Hospital, Zurich, Switzerland</nlm:aff>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Department of Neurology, Zurich University Hospital, Zurich</wicri:regionArea>
<wicri:noRegion>Zurich</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Tarnutzer, Alexander A" sort="Tarnutzer, Alexander A" uniqKey="Tarnutzer A" first="Alexander A" last="Tarnutzer">Alexander A. Tarnutzer</name>
<affiliation wicri:level="1"><nlm:aff id="I1">Department of Neurology, Zurich University Hospital, Zurich, Switzerland</nlm:aff>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Department of Neurology, Zurich University Hospital, Zurich</wicri:regionArea>
<wicri:noRegion>Zurich</wicri:noRegion>
</affiliation>
</author>
</analytic>
<series><title level="j">BMC Neuroscience</title>
<idno type="eISSN">1471-2202</idno>
<imprint><date when="2010">2010</date>
</imprint>
</series>
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</teiHeader>
<front><div type="abstract" xml:lang="en"><sec><title>Background</title>
<p>When roll-tilted, the subjective visual vertical (SVV) deviates up to 40° from earth-vertical and trial-to-trial variability increases with head roll. Imperfections in the central processing of visual information were postulated to explain these roll-angle dependent errors. For experimental conditions devoid of visual input, e.g. adjustments of body posture or of an object along vertical in darkness, significantly smaller errors were noted. Whereas the accuracy of verticality adjustments seems to depend strongly on the paradigm, we hypothesize that the precision, i.e. the inverse of trial-to-trial variability, is less influenced by the experimental setup and mainly reflects properties of the otoliths. Here we measured the subjective haptic vertical (SHV) and compared findings with previously reported SVV data. Twelve healthy right-handed human subjects (handedness assessed based on subjects' verbal report) adjusted a rod with the right hand along perceived earth-vertical during static head roll-tilts (0-360°, steps of 20°).</p>
</sec>
<sec><title>Results</title>
<p>SHV adjustments showed a tendency for clockwise rod rotations to deviate counter-clockwise and for counter-clockwise rod rotations to deviate clockwise, indicating hysteresis. Clockwise rod rotations resulted in counter-clockwise shifts of perceived earth-vertical up to -11.7° and an average counter-clockwise SHV shift over all roll angles of -3.3° (± 11.0°; ± 1 StdDev). Counter-clockwise rod rotations yielded peak SHV deviations in clockwise direction of 8.9° and an average clockwise SHV shift over all roll angles of 1.8° (± 11.1°). Trial-to-trial variability was minimal in upright position, increased with increasing roll (peaking around 120-140°) and decreased to intermediate values in upside-down orientation. Compared to SVV, SHV variability near upright and upside-down was non-significantly (p > 0.05) larger; both showed an m-shaped pattern of variability as a function of roll position.</p>
</sec>
<sec><title>Conclusions</title>
<p>The reduction of adjustment errors by eliminating visual input supports the notion that deviations between perceived and actual earth-vertical in roll-tilted positions arise from central processing of visual information. The shared roll-tilt dependent modulation of trial-to-trial variability for both SVV and SHV, on the other hand, indicates that the perception of earth-verticality is dominated by the same sensory signal, i.e. the otolith signal, independent of whether the line/rod setting is under visual or tactile control.</p>
</sec>
</div>
</front>
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<pubmed><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Precision and accuracy of the subjective haptic vertical in the roll plane.</title>
<author><name sortKey="Schuler, Jeanine R" sort="Schuler, Jeanine R" uniqKey="Schuler J" first="Jeanine R" last="Schuler">Jeanine R. Schuler</name>
<affiliation wicri:level="1"><nlm:affiliation>Department of Neurology, Zurich University Hospital, Zurich, Switzerland.</nlm:affiliation>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Department of Neurology, Zurich University Hospital, Zurich</wicri:regionArea>
<wicri:noRegion>Zurich</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Bockisch, Christopher J" sort="Bockisch, Christopher J" uniqKey="Bockisch C" first="Christopher J" last="Bockisch">Christopher J. Bockisch</name>
</author>
<author><name sortKey="Straumann, Dominik" sort="Straumann, Dominik" uniqKey="Straumann D" first="Dominik" last="Straumann">Dominik Straumann</name>
</author>
<author><name sortKey="Tarnutzer, Alexander A" sort="Tarnutzer, Alexander A" uniqKey="Tarnutzer A" first="Alexander A" last="Tarnutzer">Alexander A. Tarnutzer</name>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">PubMed</idno>
<date when="2010">2010</date>
<idno type="doi">10.1186/1471-2202-11-83</idno>
<idno type="RBID">pubmed:20630097</idno>
<idno type="pmid">20630097</idno>
<idno type="wicri:Area/PubMed/Corpus">001062</idno>
<idno type="wicri:Area/PubMed/Curation">001062</idno>
<idno type="wicri:Area/PubMed/Checkpoint">000F03</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title xml:lang="en">Precision and accuracy of the subjective haptic vertical in the roll plane.</title>
<author><name sortKey="Schuler, Jeanine R" sort="Schuler, Jeanine R" uniqKey="Schuler J" first="Jeanine R" last="Schuler">Jeanine R. Schuler</name>
<affiliation wicri:level="1"><nlm:affiliation>Department of Neurology, Zurich University Hospital, Zurich, Switzerland.</nlm:affiliation>
<country xml:lang="fr">Suisse</country>
<wicri:regionArea>Department of Neurology, Zurich University Hospital, Zurich</wicri:regionArea>
<wicri:noRegion>Zurich</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Bockisch, Christopher J" sort="Bockisch, Christopher J" uniqKey="Bockisch C" first="Christopher J" last="Bockisch">Christopher J. Bockisch</name>
</author>
<author><name sortKey="Straumann, Dominik" sort="Straumann, Dominik" uniqKey="Straumann D" first="Dominik" last="Straumann">Dominik Straumann</name>
</author>
<author><name sortKey="Tarnutzer, Alexander A" sort="Tarnutzer, Alexander A" uniqKey="Tarnutzer A" first="Alexander A" last="Tarnutzer">Alexander A. Tarnutzer</name>
</author>
</analytic>
<series><title level="j">BMC neuroscience</title>
<idno type="eISSN">1471-2202</idno>
<imprint><date when="2010" type="published">2010</date>
</imprint>
</series>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adult</term>
<term>Analysis of Variance</term>
<term>Cues</term>
<term>Female</term>
<term>Head Movements (physiology)</term>
<term>Humans</term>
<term>Male</term>
<term>Orientation (physiology)</term>
<term>Posture (physiology)</term>
<term>Rotation</term>
<term>Space Perception (physiology)</term>
<term>Visual Perception (physiology)</term>
</keywords>
<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Head Movements</term>
<term>Orientation</term>
<term>Posture</term>
<term>Space Perception</term>
<term>Visual Perception</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Adult</term>
<term>Analysis of Variance</term>
<term>Cues</term>
<term>Female</term>
<term>Humans</term>
<term>Male</term>
<term>Rotation</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">When roll-tilted, the subjective visual vertical (SVV) deviates up to 40 degrees from earth-vertical and trial-to-trial variability increases with head roll. Imperfections in the central processing of visual information were postulated to explain these roll-angle dependent errors. For experimental conditions devoid of visual input, e.g. adjustments of body posture or of an object along vertical in darkness, significantly smaller errors were noted. Whereas the accuracy of verticality adjustments seems to depend strongly on the paradigm, we hypothesize that the precision, i.e. the inverse of trial-to-trial variability, is less influenced by the experimental setup and mainly reflects properties of the otoliths. Here we measured the subjective haptic vertical (SHV) and compared findings with previously reported SVV data. Twelve healthy right-handed human subjects (handedness assessed based on subjects' verbal report) adjusted a rod with the right hand along perceived earth-vertical during static head roll-tilts (0-360 degrees , steps of 20 degrees ).</div>
</front>
</TEI>
</pubmed>
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