Auditory and vestibular input related with motor skills (postural control and gait) and with the development of visuo spacial reconstruction in pre-lingual cochlear implant users

Auditory and vestibular input related with motor skills (postural control and gait) and with the development of visuo spacial reconstruction in pre-lingual cochlear implant users

Model of Postural Control System applied in Parkinson’s disease patients

S. Nogueira, E. Ferreira, D. Geisinger, C. San Román, H. Suarez

EMBC 2010, Bs.As

Abstract In this study a simple model of the postural control system is implemented and its parameters are adjusted to explain the differences between Parkinson’s disease patient’s measures and healthy young adult’s measures by performing simulations of spontaneous sway with center-of-pressure traces. An optimization procedure was performed varying four parameters of the model. The best adjustment obtained was when the proportional and derivative factors where the same as for healthy young adults and noise level gain and force feedback gain varied independently. Differences in the latter parameter can be explained because of insufficient and slowed force production necessary to counteract perturbations in Parkinson’s disease patients while the former may be due to noise in the sensory system that estimates the vertical deviation angle and/or perturbations in the execution of the movement.

Dynamic Modeling and Experimental Results for a Head Tilt Response

Dario Geisinger, Enrique Ferreira, Alejo Suarez and Hamlet Suarez

EMBC 2010, Bs. As.

Abstract The estimation of the vertical in humans is important in everyday life although the mechanisms involved are not completely understood yet. This paper presents two sets of experiments with normal subjects, using the same virtual reality setup, aiming to help in this understanding. First, a steady state experiment is presented, which is used to determine the gravitational vertical precision while the second, a dynamical transient response experiment, is used to find dynamic models of each subject response. Results show that the dynamic models are able to reproduce the results of the steady state experiment while having the benefits that a dynamic model brings to evaluate subjects performance.