Fulltext

Antihysteresis of perceived longitudinal body axis during continuous quasi-static whole-body rotation in the earth-vertical roll plane

Tatalias, M. ; Bockisch, C. ; Bertolini, G. ; Straumann, D. ; Palla, A.

In: Experimental Brain Research, 2011, vol. 209, no. 3, p. 443-454

Ajouter à la liste personnelle
    Titre
    • Antihysteresis of perceived longitudinal body axis during continuous quasi-static whole-body rotation in the earth-vertical roll plane
    Auteur
    • Tatalias, M.. Departments of Neurology, University Hospital Zürich, Frauenklinikstrasse 26, 8091, Zurich, Switzerland
    • Bockisch, C.. Departments of Neurology, University Hospital Zürich, Frauenklinikstrasse 26, 8091, Zurich, Switzerland
    • Bertolini, G.. Departments of Neurology, University Hospital Zürich, Frauenklinikstrasse 26, 8091, Zurich, Switzerland
    • Straumann, D.. Departments of Neurology, University Hospital Zürich, Frauenklinikstrasse 26, 8091, Zurich, Switzerland
    • Palla, A.. Departments of Neurology, University Hospital Zürich, Frauenklinikstrasse 26, 8091, Zurich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Experimental Brain Research, 2011, vol. 209, no. 3, p. 443-454. Springer-Verlag
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:314360
    Summary
    Estimation of subjective whole-body tilt in stationary roll positions after rapid rotations shows hysteresis. We asked whether this phenomenon is also present during continuous quasi-static whole-body rotation and whether gravitational cues are a major contributing factor. Using a motorized turntable, 8 healthy subjects were rotated continuously about the earth-horizontal naso-occipital axis (earth-vertical roll plane) and the earth-vertical naso-occipital axis (earth-horizontal roll plane). In both planes, three full constant velocity rotations (2°/s) were completed in clockwise and counterclockwise directions (acceleration=0.05°/s2, velocity plateau reached after 40s). Subjects adjusted a visual line along the perceived longitudinal body axis (pLBA) every 2s. pLBA deviation from the longitudinal body axis was plotted as a function of whole-body roll position, and a sine function was fitted. At identical whole-body earth-vertical roll plane positions, pLBA differed depending on whether the position was reached by a rotation from upright or by passing through upside down. After the first 360° rotation, pLBA at upright whole-body position deviated significantly in the direction of rotation relative to pLBA prior to rotation initiation. This deviation remained unchanged after subsequent full rotations. In contrast, earth-horizontal roll plane rotations resulted in similar pLBA before and after each rotation cycle. We conclude that the deviation of pLBA in the direction of rotation during quasi-static earth-vertical roll plane rotations reflects static antihysteresis and might be a consequence of the known static hysteresis of ocular counterroll: a visual line that is perceived that earth-vertical is expected to be antihysteretic, if ocular torsion is hysteretic