Abstract
We propose an unsupervised recognition system for single-trial classification of motor imagery (MI) electroencephalogram (EEG) data in this study. Competitive Hopfield neural network (CHNN) clustering is used for the discrimination of left and right MI EEG data posterior to selecting active segment and extracting fractal features in multi-scale. First, we use continuous wavelet transform (CWT) and Student's two-sample t-statistics to select the active segment in the time-frequency domain. The multiresolution fractal features are then extracted from wavelet data by means of modified fractal dimension. At last, CHNN clustering is adopted to recognize extracted features. Due to the characteristic of non-supervision, it is proper for CHNN to classify non-stationary EEG signals. The results indicate that CHNN achieves 81.9% in average classification accuracy in comparison with self-organizing map (SOM) and several popular supervised classifiers on six subjects from two data sets.
Original language | English |
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Pages (from-to) | 51-62 |
Number of pages | 12 |
Journal | International Journal of Neural Systems |
Volume | 22 |
Issue number | 1 |
DOIs | |
Publication status | Published - Feb 2012 |
Externally published | Yes |
Keywords
- Brain-computer interface (BCI)
- Competitive Hopfield neural network (CHNN)
- Electroencephalogram (EEG)
- Fractal dimension (FD)
- Motor imagery (MI)
- Wavelet transform
ASJC Scopus subject areas
- Computer Networks and Communications