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Long Short-term Memory Network Performs Better in Continuous Estimation: Study

Apr 07, 2020

Surface Electromyography (sEMG) is a non-invasive, computer-based technique that can record the electrical impulses.  

However, the present pattern-recognition-based control strategy can realize some myoelectric control but it is not as smooth as human hand. 

Recently, researchers from the Shenzhen Institutes of Advanced Technology (SIAT) of the Chinese Academy of Sciences proposed a continuous estimation method for six daily grasp movements by Long Short-term Memory Network (LSTM). 

According to a study published in Biomedical Signal Processing and Control, the team designed an experiment on six daily grasp movements selected in the light of different shapes and diameters of the objects. Twenty-two sensors were spaced around on a CyberGlove for recording sEMG signals.  

To estimate six grasp movements, researchers carried out the tests through 3 evaluation criterions, Pearson Correlation Coefficient (CC), Root Mean SquareError (RMSE) and Normalized Root Mean Square Error (NRMSE).

Then they compared LSTM with the other two algorithms, SPGP (Sparse Gaussian Processes using Pseudo-inputs) and RBF (Radial Basis Function Neural Network). The results exhibited that LSTM performed better as well as faster in all 6 movements. 

Although, in some joints, SPGP or RBF has better performance than LSTM, the statistical analysis showed that LSTM could perform better in continuous estimation of 20 finger joint angles than SPGP and RBF. 

"Our results show a bright prospect of LSTM. It can be used in bioelectrical signals processing and human-machine-interaction." Said Dr. LIN Chuang, corresponding author of the study. "It should be noted that the method should be personalized and optimized based on different applications." 

  

Fig.1. Summary of the NRMSE of LSTM, RBF and SPGP for 6 movements (Image by LIN Chuang)  

  

Fig. 2. The chain structure with repetitive modules of LSTM (Image by LIN Chuang) 

sEMG-based continuous estimation of grasp movements by long-short term memory network

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