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EMG-Controlled Transradial Prostheses - An Investigation into Machine Learning Techniques

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International Journal of Computer Applications
Foundation of Computer Science (FCS), NY, USA
Year of Publication: 2017
Authors:
Mufassir Abdur Rahim, Ghulam Rasool, Nasir Ahmad
10.5120/ijca2017915354

Mufassir Abdur Rahim, Ghulam Rasool and Nasir Ahmad. EMG-Controlled Transradial Prostheses - An Investigation into Machine Learning Techniques. International Journal of Computer Applications 174(3):1-8, September 2017. BibTeX

@article{10.5120/ijca2017915354,
	author = {Mufassir Abdur Rahim and Ghulam Rasool and Nasir Ahmad},
	title = {EMG-Controlled Transradial Prostheses - An Investigation into Machine Learning Techniques},
	journal = {International Journal of Computer Applications},
	issue_date = {September 2017},
	volume = {174},
	number = {3},
	month = {Sep},
	year = {2017},
	issn = {0975-8887},
	pages = {1-8},
	numpages = {8},
	url = {http://www.ijcaonline.org/archives/volume174/number3/28384-2017915354},
	doi = {10.5120/ijca2017915354},
	publisher = {Foundation of Computer Science (FCS), NY, USA},
	address = {New York, USA}
}

Abstract

The electromyogram (EMG) signals recorded from the surface of skeletal muscles are stochastic in nature and exhibit repeatable patterns for similar muscle activations. Therefore, machine learning algorithms can be used to learn their patterns and identify the movement intent even in the absence of an actual limb. The EMG signals are recorded from the residual muscles/muscle sites after amputation (acquired or congenital) and a representative set of features is extracted. The feature data are passed on to a machine learning algorithm for training and later use in real-time for controlling a prosthetic device. Numerous features of the EMG signal based on its amplitude, spectral contents, and stochastic nature have been proposed. Similarly, various dimensionality reduction techniques, as well as, classification algorithms have also been used. In this study, we provide in-depth analyses of different features of the EMG signals and classification algorithms along with the effect of dimensionality reduction on the classification accuracy. The surface EMG data recorded from the forearm muscles of twelve able-bodied volunteers was used to extract six different feature sets (fourteen individual features). The feature data with/without dimensionality reduction was used to train and test three different classification algorithms, i.e., the linear discriminant analysis (LDA), support vector machines (SVM), and artificial neural networks (ANN). Our extensive study showed that the feature set consisting of the EMG amplitude, spectral, and stochasticity information provided the highest classification accuracy with a linear classifier, i.e., the LDA.

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Keywords

Electromyogram, Prosthesis, Linear Discriminant Analysis, Support Vector Machines, Artificial Neural Networks