Motor Imagery EEG Classification Based on Decision Tree Framework and Riemannian Geometry

Computational Intelligence and Neuroscience
Shan GuanShuning Yang

Abstract

This paper proposes a novel classification framework and a novel data reduction method to distinguish multiclass motor imagery (MI) electroencephalography (EEG) for brain computer interface (BCI) based on the manifold of covariance matrices in a Riemannian perspective. For method 1, a subject-specific decision tree (SSDT) framework with filter geodesic minimum distance to Riemannian mean (FGMDRM) is designed to identify MI tasks and reduce the classification error in the nonseparable region of FGMDRM. Method 2 includes a feature extraction algorithm and a classification algorithm. The feature extraction algorithm combines semisupervised joint mutual information (semi-JMI) with general discriminate analysis (GDA), namely, SJGDA, to reduce the dimension of vectors in the Riemannian tangent plane. And the classification algorithm replaces the FGMDRM in method 1 with k-nearest neighbor (KNN), named SSDT-KNN. By applying method 2 on BCI competition IV dataset 2a, the kappa value has been improved from 0.57 to 0.607 compared to the winner of dataset 2a. And method 2 also obtains high recognition rate on the other two datasets.

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Citations

Dec 31, 2019·Computational Intelligence and Neuroscience·Mauricio Adolfo Ramírez-Moreno, David Gutiérrez
Mar 17, 2020·Computers in Biology and Medicine·Desmond Chuang Kiat SohU Rajendra Acharya

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Software Mentioned

MEMDBF
SSDT
FGMDRM
SJGDA
MDRM
FGMDM
Emotiv Epoc +
GDA

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