Head positioning control in a gravito-inertial field and in normal gravity - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Vestibular Research Année : 2004

Head positioning control in a gravito-inertial field and in normal gravity

F Sares
  • Fonction : Auteur
Jm Prieur
  • Fonction : Auteur

Résumé

The way in which the head is controlled in roll was investigated by dissociating the body axis and the gravito-inertial force orientation. Seated subjects (N = 8) were requested to align their head with their trunk, 30degrees to the left, 30degrees to the right or with the gravito- inertial vector, before, during (Per Rotation), after off-center rotation and on a tilted chair without rotation (Tilted). The gravito-inertial vector angle during rotation and the chair tilt angle were identical (17degrees). The subjects were either in total darkness or facing a visual frame that was fixed to the trunk. Both final error and within-subject variability of head positioning increased when the body axis and the gravito- inertial vector were dissociated (Per Rotation and Tilted). However, the behavior was different depending on whether the subjects were in the Tilted or Per Rotation conditions. The presentation of the visual frame reduced the within-subject variability and modified the perception of the gravito-inertial vector's orientation on the tilted chair. As head positioning with respect to the body and sensing of the gravito-inertial vector are modified when body axis and gravito-inertial vector orientation are dissociated, the observed decrease in performance while executing motor tasks in a gravito-inertial field may be at least in part attributed to the inaccurate sensing of head position.

Domaines

Neurosciences
Fichier non déposé

Dates et versions

hal-01436302 , version 1 (16-01-2017)

Identifiants

  • HAL Id : hal-01436302 , version 1

Citer

F Sares, C Bourdin, Jm Prieur, Jean-Louis Vercher. Head positioning control in a gravito-inertial field and in normal gravity. Journal of Vestibular Research, 2004, 14 (4), pp.321-333. ⟨hal-01436302⟩
49 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More