Exploring coordination dynamics of the postural system with real-time visual feedback

The role of visual cues in the acquisition and transfer of a voluntary postural sway task

“…In periodic postural sway, the frequency of the target motion is the control parameter for the emergence of inherently stable ankle-hip coordination modes [15]. In the present study, the target frequency was constant and sufficiently low to evoke a close to in-phase (relative phase %208) ankle-hip relationship which is consistent with previous literature [15].…”

Motor Control and Learning

“…The present results, together with the modeling effort reported in this chapter, support the conjecture that in-phase and anti-phase patterns observed during standing are emergent properties of the interaction between the natural tendencies of the postural systems and the external and internal constraints that shape coordination dynamics (e.g., Bardy, 2004, Faugloire, Bardy, Merhi & Stoffregen, 2005. The presence of appropriate constraints-not only including environmental or individual constraints but also task goals, such as the instruction to learn a novel pattern-is a prerequisite for the emergence of specific coordination patterns.…”

On Perturbation and Pattern Coexistence in Postural Coordination Dynamics

“…They exhibit persistence and changes that are characteristic of nonlinear systems . Moreover, one learns those patterns by modifying the intrinsic dynamics of the postural system (Bardy, Faugloire, & Fourcade, 2006;Faugloire et al, 2005). The results of the just-mentioned experiments are inconsistent with the single inverted-pendulum analogy, a point that has been made explicitly in each of those articles.…”

“…Inspired by dynamical systems theory (Kelso, 1995;Turvey, 1990) and by synergetics (Haken, 1983), postural coordination dynamics has emerged as an alternative way of understanding the coordination of multiple body segments in the control of stance (for a review, see Oullier, Marin, Stoffregen, Bootsma, & Bardy, 2006). Postural coordination dynamics has been embraced by many students of postural control (e.g., Bardy et al, 1999;Buchanan & Horak, 1999;Dijsktra, Schöner, Giese, & Gielen, 1994;Faugloire, Bardy, Merhi, & Stoffregen, 2005;Ko, Challis, Stitt, & Newell, 2003;Martin, Cahouët, Ferry, & Fouque, 2006;Oullier, Bardy, Stoffegen, & Bootsma, 2002;Schöner, 1991;Stirling & Zakynthinaki, 2004). In that approach, postural coordination patterns are considered as attractors, and transitions between patterns are thought to be governed by principles of self-organization.…”