A fingertip force prediction model for grasp patterns characterised from the chaotic behaviour of EEG

Medical & Biological Engineering & Computing
Rinku RoyC S Kumar

Abstract

A stable grasp is attained through appropriate hand preshaping and precise fingertip forces. Here, we have proposed a method to decode grasp patterns from motor imagery and subsequent fingertip force estimation model with a slippage avoidance strategy. We have developed a feature-based classification of electroencephalography (EEG) associated with imagination of the grasping postures. Chaotic behaviour of EEG for different grasping patterns has been utilised to capture the dynamics of associated motor activities. We have computed correlation dimension (CD) as the feature and classified with "one against one" multiclass support vector machine (SVM) to discriminate between different grasping patterns. The result of the analysis showed varying classification accuracies at different subband levels. Broad categories of grasping patterns, namely, power grasp and precision grasp, were classified at a 96.0% accuracy rate in the alpha subband. Furthermore, power grasp subtypes were classified with an accuracy of 97.2% in the upper beta subband, whereas precision grasp subtypes showed relatively lower 75.0% accuracy in the alpha subband. Following assessment of fingertip force distributions while grasping, a nonlinear autoregressive (NAR...Continue Reading

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Citations

Jul 14, 2020·Computers in Biology and Medicine·Rinku RoyManjunatha Mahadevappa

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Methods Mentioned

BETA
feature extraction
force prediction

Software Mentioned

SVM
MATLAB
EEGLAB

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