Error mapping controller: a closed loop neuroprosthesis controlled by artificial neural networksReportar como inadecuado

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Journal of NeuroEngineering and Rehabilitation

, 3:25

First Online: 09 October 2006Received: 28 March 2006Accepted: 09 October 2006


BackgroundThe design of an optimal neuroprostheses controller and its clinical use presents several challenges. First, the physiological system is characterized by highly inter-subjects varying properties and also by non stationary behaviour with time, due to conditioning level and fatigue. Secondly, the easiness to use in routine clinical practice requires experienced operators. Therefore, feedback controllers, avoiding long setting procedures, are required.

MethodsThe error mapping controller EMC here proposed uses artificial neural networks ANNs both for the design of an inverse model and of a feedback controller. A neuromuscular model is used to validate the performance of the controllers in simulations. The EMC performance is compared to a Proportional Integral Derivative PID included in an anti wind-up scheme called PIDAW and to a controller with an ANN as inverse model and a PID in the feedback loop NEUROPID. In addition tests on the EMC robustness in response to variations of the Plant parameters and to mechanical disturbances are carried out.

ResultsThe EMC shows improvements with respect to the other controllers in tracking accuracy, capability to prolong exercise managing fatigue, robustness to parameter variations and resistance to mechanical disturbances.

ConclusionDifferent from the other controllers, the EMC is capable of balancing between tracking accuracy and mapping of fatigue during the exercise. In this way, it avoids overstressing muscles and allows a considerable prolongation of the movement. The collection of the training sets does not require any particular experimental setting and can be introduced in routine clinical practice.

Electronic supplementary materialThe online version of this article doi:10.1186-1743-0003-3-25 contains supplementary material, which is available to authorized users.

An erratum to this article is available at

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Autor: Alessandra Pedrocchi - Simona Ferrante - Elena De Momi - Giancarlo Ferrigno


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