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Electrotactile feedback improves performance and facilitates learning in the routine grasping task

Milica Isaković, Minja Belić, Matija Štrbac, Igor Popović, Strahinja Došen, Dario Farina, Thierry Keller
  • Milica Isaković
    Tecnalia Serbia Ltd., Belgrade; University of Belgrade – School of Electrical Engineering, Belgrade, Serbia | isakovic@etf.rs
  • Minja Belić
    Tecnalia Serbia Ltd., Belgrade; University of Belgrade, Belgrade, Serbia
  • Matija Štrbac
    Tecnalia Serbia Ltd., Belgrade; University of Belgrade – School of Electrical Engineering, Belgrade, Serbia
  • Igor Popović
    Specialized Hospital for Rehabilitation and Orthopedic Prostetics, Belgrade, Serbia
  • Strahinja Došen
    Institute of Neurorehabilitation Systems, University Medical Center Göttingen (UMG), Georg-August University, Göttingen, Germany
  • Dario Farina
    Institute of Neurorehabilitation Systems, University Medical Center Göttingen (UMG), Georg-August University, Göttingen, Germany
  • Thierry Keller
    Tecnalia Research & Innovation – Health Division, San Sebastián, Spain

Abstract

Aim of this study was to investigate the feasibility of electrotactile feedback in closed loop training of force control during the routine grasping task. The feedback was provided using an array electrode and a simple six-level spatial coding, and the experiment was conducted in three amputee subjects. The psychometric tests confirmed that the subjects could perceive and interpret the electrotactile feedback with a high success rate. The subjects performed the routine grasping task comprising 4 blocks of 60 grasping trials. In each trial, the subjects employed feedforward control to close the hand and produce the desired grasping force (four levels). First (baseline) and the last (validation) session were performed in open loop, while the second and the third session (training) included electrotactile feedback. The obtained results confirmed that using the feedback improved the accuracy and precision of the force control. In addition, the subjects performed significantly better in the validation vs. baseline session, therefore suggesting that electrotactile feedback can be used for learning and training of myoelectric control.

Keywords

Electrotactile stimulation; Force feedback; Myoelectric prosthesis; Amputees; Routine grasping

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Submitted: 2016-06-08 10:27:09
Published: 2016-09-13 00:00:00
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Copyright (c) 2016 Milica Isaković, Minja Belić, Matija Štrbac, Igor Popović, Strahinja Došen, Dario Farina, Thierry Keller

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