Publication: Reach-to-grasp motions: Towards a dynamic classification approach for upper-limp prosthesis
During reach-to-grasp motions, the Electromyo-graphic (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)
- DOI: 10.1109/NER.2019.8717110
- Date: 2019
Posted on: June 18, 2019
Keywords: arm-motion, biomechanics, dynamic classification approach, elbow angular velocity, electromyographic activity, electromyography, emg signals results, gaussian distribution, low classification accuracy, medical signal processing, motion phases, motion stage, muscle activity, muscles, reach-to-grasp motions, reaching phase, signal classification, upper limb prosthesis