A Fuzzy Controller for Movement Stabilization Using Afferent Control: Controller Synthesis and Simulation

Zahra Khodadadi, Hamid Reza Kobravi, Milad Faryar Majd

DOI: 10.4103/jmss.JMSS_43_16

Abstract


Stimulation of spinal sensorimotor circuits can improve motor control in animal models and humans
with spinal cord injury (SCI). More recent evidence suggests that the stimulation increases the level
of excitability in the spinal circuits, activates central pattern generators, and it is also able to recruit
distinctive afferent pathways connected to specifc sensorimotor circuits. In addition, the stimulation
generates well‑defned responses in leg muscles after each pulse. The problem is that in most of the
neuromodulation devices, electrical stimulation parameters are regulated manually and stay constant
during movement. Such a technique is likely suboptimal to intercede maximum therapeutic effects
in patients. Therefore, in this article, a fuzzy controller has been designed to control limb kinematics
during locomotion using the afferent control in a neuromechanical model without supraspinal drive
simulating post‑SCI situation. The proposed controller automatically tunes the weights of group Ia
afferent inputs of the spinal cord to reset the phase appropriately during the reaction to an external
perturbation. The kinematic motion data and weights of group Ia afferent inputs were the input and
output of the controller, respectively. Simulation results showed the acceptable performance of the
controller to establish adaptive locomotion against the perturbing forces based on the phase resetting
of the walking rhythm.

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References


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