MovDisordV3, Main, Exploration, bibRecord, 005290

Perception of spatial orientation in spasmodic torticollis part I: The postural vertical

Identifieur interne : 005290 ( Main/Exploration ); précédent : 005289; suivant : 005291

Perception of spatial orientation in spasmodic torticollis part I: The postural vertical

Auteurs : Anastasopoulos [Grèce, Royaume-Uni] ; K. Bhatia [Royaume-Uni] ; A. Bisdorff [Royaume-Uni] ; A. M. Bronstein [Royaume-Uni] ; M. A. Gresty [Royaume-Uni] ; C. D. Marsden [Royaume-Uni]

Source :

Movement Disorders [ 0885-3185 ] ; 1997-07.

RBID : ISTEX:D441E1AF7E4315F7D221194F4018758634D204C0

English descriptors

KwdEn :
- Adult, Analysis of Variance, Case-Control Studies, Discrimination (Psychology) (physiology), Dystonia, Dystonia (physiopathology), Gravity Sensing (physiology), Head (physiopathology), Humans, Intervention Studies, Middle Aged, Motion Perception (physiology), Neck (physiopathology), Orientation (physiology), Perception, Perceptual Distortion (physiology), Posture, Posture (physiology), Proprioception (physiology), Regression Analysis, Space Perception (physiology), Spasm (physiopathology), Spatial orientation, Torticollis, Torticollis (physiopathology), Vision, Visual Perception (physiology).
MESH :
- physiology : Discrimination (Psychology), Gravity Sensing, Motion Perception, Orientation, Perceptual Distortion, Posture, Proprioception, Space Perception, Visual Perception.
- physiopathology : Dystonia, Head, Neck, Spasm, Torticollis.
- Adult, Analysis of Variance, Case-Control Studies, Humans, Intervention Studies, Middle Aged, Perception, Regression Analysis.

Abstract

Estimates of points of entering and exiting from upright posture were obtained from 25 seated, restrained patients with idiopathic spasmodic torticollis (ST) and matched normal subjects exposed to cycles of 1.5°/s tilts in a flight simulator. Estimates were obtained for displacements in roll and pitch about upright and for yaw tilts about a rostrocaudal, “barbecue,” axis with the subjects supinated. For both pitch and roll, normal subjects estimated entering upright when they were still ∼1° from machine upright and perceived themselves to be upright through a mean arc of 6°. In barbecue tilt, entering upright was estimated at 0.2° for an arc of 6°. Patients estimated entering upright at 2.8° in roll and 3° in pitch but estimated exiting upright at the same tilt as normal subjects; that is, they were less specific in detecting verticality. Patients were normal in barbecue tilt. No relationship between tilt estimates and head deviation was found. There were no differences between normal subjects when tested with their head in normal posture and with an assumed tilt of 20°. Normal subjects probably based their estimates on combined vestibularsomatosensory signals, whereas torticollis patients appeared to derive more from a vestibular signal. However, patients referred the vestibular signals to the trunk long axis when asked to indicate the whole‐body vertical. The findings suggest disruption of the normal combined vestibuloproprioceptive mechanism for detecting body uprightness in ST.

Url:

DOI: 10.1002/mds.870120413

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en">Estimates of points of entering and exiting from upright posture were obtained from 25 seated, restrained patients with idiopathic spasmodic torticollis (ST) and matched normal subjects exposed to cycles of 1.5°/s tilts in a flight simulator. Estimates were obtained for displacements in roll and pitch about upright and for yaw tilts about a rostrocaudal, “barbecue,” axis with the subjects supinated. For both pitch and roll, normal subjects estimated entering upright when they were still ∼1° from machine upright and perceived themselves to be upright through a mean arc of 6°. In barbecue tilt, entering upright was estimated at 0.2° for an arc of 6°. Patients estimated entering upright at 2.8° in roll and 3° in pitch but estimated exiting upright at the same tilt as normal subjects; that is, they were less specific in detecting verticality. Patients were normal in barbecue tilt. No relationship between tilt estimates and head deviation was found. There were no differences between normal subjects when tested with their head in normal posture and with an assumed tilt of 20°. Normal subjects probably based their estimates on combined vestibularsomatosensory signals, whereas torticollis patients appeared to derive more from a vestibular signal. However, patients referred the vestibular signals to the trunk long axis when asked to indicate the whole‐body vertical. The findings suggest disruption of the normal combined vestibuloproprioceptive mechanism for detecting body uprightness in ST.</div>
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Movement Disorders (revue)

Perception of spatial orientation in spasmodic torticollis part I: The postural vertical

Perception of spatial orientation in spasmodic torticollis part I: The postural vertical

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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	Movement Disorders (revue)
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