OcrV1, PascalFrancis, Corpus, bibRecord, 000234

Modulation of Saccade Curvature by Ocular Counterroll

Identifieur interne : 000234 ( PascalFrancis/Corpus ); précédent : 000233; suivant : 000235

Modulation of Saccade Curvature by Ocular Counterroll

Auteurs : Konrad P. Weber ; Christopher J. Bockisch ; Itsaso Olasagasti ; Dominik Straumann

Source :

Investigative ophthalmology & visual science [ 0146-0404 ] ; 2009.

RBID : Pascal:09-0137149

Descripteurs français

Pascal (Inist)
- Modulation, Courbure, Oculaire, Oeil, Ophtalmologie.

English descriptors

KwdEn :
- Curvature, Eye, Modulation, Ocular, Ophthalmology.

Abstract

PURPOSE. On close inspection, it can be seen that most saccadic trajectories are not straight but curve slightly; in other words, they are not single-axis ocular rotations. The authors asked whether saccade curvatures are systematically influenced by static ocular counterroll (OCR). METHODS. OCR was elicited by static whole-body roll position. Eight healthy human subjects performed horizontal and vertical saccades (10° amplitude; 0° and 10° eccentricity; head-fixed coordinate system) in upright and ear-down whole-body roll positions (45° right, 45° left). Three-dimensional eye movements were recorded with modified dual-search coils at 1000 Hz. RESULTS. Saccade curvature was systematically modulated by OCR depending on saccade direction. In the horizontal-vertical plane, primarily vertical saccades were modulated with downward saccades curving toward the upper ear and upward saccades curving toward the lower ear. Modulation of saccade curvature in the torsional direction correlated significantly with OCR only in abducting saccades. CONCLUSIONS. No universal mechanism, such as visual-motor coordinate transformation or kinematic characteristics of the saccadic burst generator, alone could explain the complex modulation pattern of saccade curvature. OCR-induced changes of the ocular motor plant, including transient force imbalances between agonist eye muscles (vertical rectus and oblique muscles) and shifting eye muscle pulleys, are suitable to explain the found direction-dependent modulation pattern.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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A08	`01`	`1`	`ENG`	`@1 Modulation of Saccade Curvature by Ocular Counterroll`
A11	`01`	`1`		`@1 WEBER (Konrad P.)`
A11	`02`	`1`		`@1 BOCKISCH (Christopher J.)`
A11	`03`	`1`		`@1 OLASAGASTI (Itsaso)`
A11	`04`	`1`		`@1 STRAUMANN (Dominik)`
A14	`01`			`@1 Department of Neurology, Zurich University Hospital @2 Zurich @3 CHE @Z 1 aut. @Z 2 aut. @Z 3 aut. @Z 4 aut.`
A14	`02`			`@1 Department of Ophthalmology, Zurich University Hospital @2 Zurich @3 CHE @Z 2 aut.`
A14	`03`			`@1 Department of Otorhinolaryngology, Zurich University Hospital @2 Zurich @3 CHE @Z 2 aut.`
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A21				`@1 2009`
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A43	`01`			`@1 INIST @2 12095 @5 354000187319510250`
A44				`@0 0000 @1 © 2009 INIST-CNRS. All rights reserved.`
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C01	`01`		`ENG`	@0 PURPOSE. On close inspection, it can be seen that most saccadic trajectories are not straight but curve slightly; in other words, they are not single-axis ocular rotations. The authors asked whether saccade curvatures are systematically influenced by static ocular counterroll (OCR). METHODS. OCR was elicited by static whole-body roll position. Eight healthy human subjects performed horizontal and vertical saccades (10° amplitude; 0° and 10° eccentricity; head-fixed coordinate system) in upright and ear-down whole-body roll positions (45° right, 45° left). Three-dimensional eye movements were recorded with modified dual-search coils at 1000 Hz. RESULTS. Saccade curvature was systematically modulated by OCR depending on saccade direction. In the horizontal-vertical plane, primarily vertical saccades were modulated with downward saccades curving toward the upper ear and upward saccades curving toward the lower ear. Modulation of saccade curvature in the torsional direction correlated significantly with OCR only in abducting saccades. CONCLUSIONS. No universal mechanism, such as visual-motor coordinate transformation or kinematic characteristics of the saccadic burst generator, alone could explain the complex modulation pattern of saccade curvature. OCR-induced changes of the ocular motor plant, including transient force imbalances between agonist eye muscles (vertical rectus and oblique muscles) and shifting eye muscle pulleys, are suitable to explain the found direction-dependent modulation pattern.
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Format Inist (serveur)

NO :	PASCAL 09-0137149 INIST
ET :	Modulation of Saccade Curvature by Ocular Counterroll
AU :	WEBER (Konrad P.); BOCKISCH (Christopher J.); OLASAGASTI (Itsaso); STRAUMANN (Dominik)
AF :	Department of Neurology, Zurich University Hospital/Zurich/Suisse (1 aut., 2 aut., 3 aut., 4 aut.); Department of Ophthalmology, Zurich University Hospital/Zurich/Suisse (2 aut.); Department of Otorhinolaryngology, Zurich University Hospital/Zurich/Suisse (2 aut.)
DT :	Publication en série; Niveau analytique
SO :	Investigative ophthalmology & visual science; ISSN 0146-0404; Coden IOVSDA; Etats-Unis; Da. 2009; Vol. 50; No. 3; Pp. 1158-1167; Bibl. 44 ref.
LA :	Anglais
EA :	PURPOSE. On close inspection, it can be seen that most saccadic trajectories are not straight but curve slightly; in other words, they are not single-axis ocular rotations. The authors asked whether saccade curvatures are systematically influenced by static ocular counterroll (OCR). METHODS. OCR was elicited by static whole-body roll position. Eight healthy human subjects performed horizontal and vertical saccades (10° amplitude; 0° and 10° eccentricity; head-fixed coordinate system) in upright and ear-down whole-body roll positions (45° right, 45° left). Three-dimensional eye movements were recorded with modified dual-search coils at 1000 Hz. RESULTS. Saccade curvature was systematically modulated by OCR depending on saccade direction. In the horizontal-vertical plane, primarily vertical saccades were modulated with downward saccades curving toward the upper ear and upward saccades curving toward the lower ear. Modulation of saccade curvature in the torsional direction correlated significantly with OCR only in abducting saccades. CONCLUSIONS. No universal mechanism, such as visual-motor coordinate transformation or kinematic characteristics of the saccadic burst generator, alone could explain the complex modulation pattern of saccade curvature. OCR-induced changes of the ocular motor plant, including transient force imbalances between agonist eye muscles (vertical rectus and oblique muscles) and shifting eye muscle pulleys, are suitable to explain the found direction-dependent modulation pattern.
CC :	002B09; 002A25I
FD :	Modulation; Courbure; Oculaire; Oeil; Ophtalmologie
ED :	Modulation; Curvature; Ocular; Eye; Ophthalmology
SD :	Modulación; Curvatura; Ocular; Ojo; Oftalmología
LO :	INIST-12095.354000187319510250
ID :	09-0137149

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Pascal:09-0137149

Le document en format XML

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<front><div type="abstract" xml:lang="en">PURPOSE. On close inspection, it can be seen that most saccadic trajectories are not straight but curve slightly; in other words, they are not single-axis ocular rotations. The authors asked whether saccade curvatures are systematically influenced by static ocular counterroll (OCR). METHODS. OCR was elicited by static whole-body roll position. Eight healthy human subjects performed horizontal and vertical saccades (10° amplitude; 0° and 10° eccentricity; head-fixed coordinate system) in upright and ear-down whole-body roll positions (45° right, 45° left). Three-dimensional eye movements were recorded with modified dual-search coils at 1000 Hz. RESULTS. Saccade curvature was systematically modulated by OCR depending on saccade direction. In the horizontal-vertical plane, primarily vertical saccades were modulated with downward saccades curving toward the upper ear and upward saccades curving toward the lower ear. Modulation of saccade curvature in the torsional direction correlated significantly with OCR only in abducting saccades. CONCLUSIONS. No universal mechanism, such as visual-motor coordinate transformation or kinematic characteristics of the saccadic burst generator, alone could explain the complex modulation pattern of saccade curvature. OCR-induced changes of the ocular motor plant, including transient force imbalances between agonist eye muscles (vertical rectus and oblique muscles) and shifting eye muscle pulleys, are suitable to explain the found direction-dependent modulation pattern.</div>
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<server><NO>PASCAL 09-0137149 INIST</NO>
<ET>Modulation of Saccade Curvature by Ocular Counterroll</ET>
<AU>WEBER (Konrad P.); BOCKISCH (Christopher J.); OLASAGASTI (Itsaso); STRAUMANN (Dominik)</AU>
<AF>Department of Neurology, Zurich University Hospital/Zurich/Suisse (1 aut., 2 aut., 3 aut., 4 aut.); Department of Ophthalmology, Zurich University Hospital/Zurich/Suisse (2 aut.); Department of Otorhinolaryngology, Zurich University Hospital/Zurich/Suisse (2 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Investigative ophthalmology & visual science; ISSN 0146-0404; Coden IOVSDA; Etats-Unis; Da. 2009; Vol. 50; No. 3; Pp. 1158-1167; Bibl. 44 ref.</SO>
<LA>Anglais</LA>
<EA>PURPOSE. On close inspection, it can be seen that most saccadic trajectories are not straight but curve slightly; in other words, they are not single-axis ocular rotations. The authors asked whether saccade curvatures are systematically influenced by static ocular counterroll (OCR). METHODS. OCR was elicited by static whole-body roll position. Eight healthy human subjects performed horizontal and vertical saccades (10° amplitude; 0° and 10° eccentricity; head-fixed coordinate system) in upright and ear-down whole-body roll positions (45° right, 45° left). Three-dimensional eye movements were recorded with modified dual-search coils at 1000 Hz. RESULTS. Saccade curvature was systematically modulated by OCR depending on saccade direction. In the horizontal-vertical plane, primarily vertical saccades were modulated with downward saccades curving toward the upper ear and upward saccades curving toward the lower ear. Modulation of saccade curvature in the torsional direction correlated significantly with OCR only in abducting saccades. CONCLUSIONS. No universal mechanism, such as visual-motor coordinate transformation or kinematic characteristics of the saccadic burst generator, alone could explain the complex modulation pattern of saccade curvature. OCR-induced changes of the ocular motor plant, including transient force imbalances between agonist eye muscles (vertical rectus and oblique muscles) and shifting eye muscle pulleys, are suitable to explain the found direction-dependent modulation pattern.</EA>
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<ED>Modulation; Curvature; Ocular; Eye; Ophthalmology</ED>
<SD>Modulación; Curvatura; Ocular; Ojo; Oftalmología</SD>
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<ID>09-0137149</ID>
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   |texte=   Modulation of Saccade Curvature by Ocular Counterroll
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Modulation of Saccade Curvature by Ocular Counterroll

Modulation of Saccade Curvature by Ocular Counterroll

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