Sensory supplementation system based on electrotactile tongue biofeedback of head position for balance control.

Nicolas Vuillerme (1) , Nicolas Pinsault (1) , Olivier Chenu (1) , Jacques Demongeot (1) , Yohan Payan (2) , Yuri Danilov (3)

1 TIMC-IMAG - Techniques de l'Ingénierie Médicale et de la Complexité - Informatique, Mathématiques et Applications, Grenoble - UMR 5525
2 TIMC-IMAG-GMCAO - Gestes Medico-chirurgicaux Assistés par Ordinateur
3 TCNL - The Tactile Communication and Neuromodulation Laboratory

The present study aimed at investigating the effects of an artificial head position-based tongue-placed electrotactile biofeedback on postural control during quiet standing under different somatosensory conditions from the support surface. Eight young healthy adults were asked to stand as immobile as possible with their eyes closed on two Firm and Foam support surface conditions executed in two conditions of No-biofeedback and Biofeedback. In the Foam condition, a 6-cm thick foam support surface was placed under the subjects' feet to alter the quality and/or quantity of somatosensory information at the plantar sole and the ankle. The underlying principle of the biofeedback consisted of providing supplementary information about the head orientation with respect to gravitational vertical through electrical stimulation of the tongue. Centre of foot pressure (CoP) displacements were recorded using a force platform. Larger CoP displacements were observed in the Foam than Firm conditions in the two conditions of No-biofeedback and Biofeedback. Interestingly, this destabilizing effect was less accentuated in the Biofeedback than No-biofeedback condition. In accordance with the sensory re-weighting hypothesis for balance control, the present findings evidence that the availability of the central nervous system to integrate an artificial head orientation information delivered through electrical stimulation of the tongue to limit the postural perturbation induced by alteration of somatosensory input from the support surface.

Mots clés: Balance; Biofeedback; Centre of foot pressure; Sensory re-weighting; Tongue Display Unit

Domaines: Biomécanique [physics.med-ph]; Biomécanique [physics.med-ph]; Ingénierie biomédicale; Neurosciences

Nicolas Vuillerme, Nicolas Pinsault, Olivier Chenu, Jacques Demongeot, Yohan Payan, et al.. Sensory supplementation system based on electrotactile tongue biofeedback of head position for balance control.. Neuroscience Letters, 2008, 431 (3), pp.206-10. ⟨10.1016/j.neulet.2007.11.049⟩. ⟨hal-00245700⟩