Local Temporal Correlation Common Spatial Patterns for Single Trial EEG Classification during Motor Imagery

• Published in: Computational and mathematical methods in medicine Vol. 2013; no. 2013; pp. 1 - 7
• Main Authors: Zhang, Rui, Xu, Peng, Liu, Tiejun, Zhang, Yangsong, Guo, Lanjin, Li, Peiyang, Yao, Dezhong
• Format: Journal Article
• Language: English
• Published: Cairo, Egypt Hindawi Puplishing Corporation 01.01.2013; Hindawi Publishing Corporation
• Subjects: Adult; Algorithms; Brain Mapping - methods; Brain-Computer Interfaces; Electroencephalography - methods; Female; Humans; Imagery (Psychotherapy); Male; Models, Theoretical; Motor Skills - physiology; Pattern Recognition, Automated; Reproducibility of Results; Signal Processing, Computer-Assisted; User-Computer Interface; Young Adult
• ISSN: 1748-670X; 1748-6718
• DOI: 10.1155/2013/591216

Common spatial pattern (CSP) is one of the most popular and effective feature extraction methods for motor imagery-based brain-computer interface (BCI), but the inherent drawback of CSP is that the estimation of the covariance matrices is sensitive to noise. In this work, local temporal correlation (LTC) information was introduced to further improve the covariance matrices estimation (LTCCSP). Compared to the Euclidean distance used in a previous CSP variant named local temporal CSP (LTCSP), the correlation may be a more reasonable metric to measure the similarity of activated spatial patterns existing in motor imagery period. Numerical comparisons among CSP, LTCSP, and LTCCSP were quantitatively conducted on the simulated datasets by adding outliers to Dataset IVa of BCI Competition III and Dataset IIa of BCI Competition IV, respectively. Results showed that LTCCSP achieves the highest average classification accuracies in all the outliers occurrence frequencies. The application of the three methods to the EEG dataset recorded in our laboratory also demonstrated that LTCCSP achieves the highest average accuracy. The above results consistently indicate that LTCCSP would be a promising method for practical motor imagery BCI application.