Journal
MEDICAL ENGINEERING & PHYSICS
Volume 37, Issue 3, Pages 280-286Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.medengphy.2015.01.005
Keywords
Brain-computer interface (BCI); Near-infrared spectroscopy (NIRS); Empirical mode decomposition (EMD); Joint mutual information (JMI)
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Funding
- National Natural Science Foundation (NNSF) of China [61203368, 81470084, 61463024]
- National High Technology Research and Development Program of China (863 Program) [2012AA02A605]
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Near-infrared spectroscopy (NIRS) is a non-invasive optical technique used for brain-computer interface (BCI). This study aims to investigate the brain hemodynamic responses of clench force and speed motor imagery and extract task-relevant features to obtain better classification performance. Given the non-stationary characteristics of real hemodynamic measurements, empirical mode decomposition (EMD) was applied to reduce the physiological noise overwhelmed in the task-relevant NIRS signals. Compared with continuous wavelet decomposition, EMD does not require a pre-determined basis function. EMD decomposes the original signals into a set of intrinsic mode functions (IMFs). In this study, joint mutual information was applied to select the optimal features, and support vector machine was used as a classifier. Offline and pseudo-online analyses showed that the most feasible classification accuracy can be obtained using IMFs as input features. Accordingly, an alternative feature is provided to develop the NIRS-BCI system. (C) 2015 IPEM. Published by Elsevier Ltd. All rights reserved.
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