Reach-to-grasp motions: Towards a dynamic classification approach for upper-limp prosthesis

During reach-to-grasp motions,the Electromyographic (EMG) activity of the arm varies depending on motion stage. The variability of the EMG signals results in low classification accuracy during the reaching phase, delaying the activation of the prosthesis. To increase the efficiency of the pattern-recognition system, we investigate the muscle activity of four individuals with below-elbow amputation performing reach-to-grasp motions and segment the arm-motion into three phases with respect to the extension of the arm. Furthermore, we model the dynamic muscle contractions of each class with Gaussian distributions over the different phases and the overall motion. We quantify of the overlap among the classes with the Hellinger distance and notice larger values and, thus, smaller overlaps among the classes with the segmentation to motion phases. A Linear Discriminant Analysis classifier with phase segmentation affects positively the classification accuracy by 6−10 on average.


Published in:
2019 9th International IEEE/EMBS Conference on Neural Engineering (NER), 287-290
Presented at:
2019 9th International IEEE/EMBS Conference on Neural Engineering (NER), San Francisco, California, USA, 20-23 March 2019
Year:
Mar 25 2019
Publisher:
IEEE
ISBN:
1948-3554
Keywords:
Laboratories:




 Record created 2019-06-17, last modified 2019-08-12

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