How visual information links to multijoint coordination during quiet standing
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The link between visual information and postural control was investigated based on a multi-degree-of-freedom model using the framework of the uncontrolled manifold (UCM) hypothesis. The hypothesis was that because visual information specifies the position of the body in space, it would couple preferentially into those combinations of degrees of freedom (DOFs) that move the body in space and not into combinations of DOFs that do not move the body in space. Subjects stood quietly in a virtual reality cave for 4-min trials with or without a 0.2, 2.0 Hz, or combined 0.2 and 2.0 Hz visual field perturbation that was below perceptual threshold. Motion analysis was used to compute six sagittal plane joint angles. Variance across time of the angular motion was partitioned into (1) variance associated with motion of the body and (2) variance reflecting the use of flexible joint combinations that keep the anterior–posterior positions of the head (HDPOS) and center of mass (CMPOS) invariant. UCM analysis was performed in the frequency domain in order to link the sensory perturbation to each variance component at different frequencies. As predicted, variance related to motion of the body was selectively increased at the 0.2-Hz drive frequency but not at other frequencies of sway for both CMPOS and HDPOS. The dominant effect with the 2.0-Hz visual drive also was limited largely to variance related to motion of the body.
KeywordsVisual perception Multijoint coordination Uncontrolled manifold Posture
This research was supported by the Grant 0957920, awarded to John Scholz and John Jeka from the National Science Foundation and Grant Scho336/7-1 from the Deutsche Forschungsgemeinschaft awarded to Gregor Schöner.
- Anastasio T, Patton P (2004) Analysis and modeling of multisensory enhancement in the deep superior colliculus. In: Calvert G, Spence C, Stein BE (eds) Handbook of multisensory processes. MIT Press, BostonGoogle Scholar
- Feldman AG, Levin MF (1995) The origin and use of positional frames of reference in motor control. Behav Brain Sci 18:723–806Google Scholar
- Horak FB, Macpherson JM (1996) Postural orientation and equilibrium. In: Shepard J, Rowell L (eds) Handbook of physiology. Oxford University Press, New York, pp 255–292Google Scholar
- Kuo AD, Speers RA, Peterka RJ, Horak FB (1998) Effect of altered sensory conditions on multivariate descriptors of human postural sway. Exp Brain Res 122:185–195Google Scholar
- Reimann H, Schöner G, Scholz JP (2011) Visual information is sufficient for maintaining upright stance—a multi-joint model of human posture. In: 41st Annual meeting of the Society for Neuroscience, vol 184.05/RR1. Washington Convention Center, Washington, DCGoogle Scholar
- Tseng YW, Scholz JP (2005) The effect of workspace on the use of motor abundance. Mot Control 9:75–100Google Scholar
- Tseng Y, Scholz JP, Schoner G (2002) Goal-equivalent joint coordination in pointing: affect of vision and arm dominance. Mot Control 6:183–207Google Scholar
- Zatsiorsky VM, Duarte M (2000) Rambling and trembling in quiet standing. Mot Control 4:185Google Scholar