A semi-supervised support vector machine approach for parameter setting in motor imagery-based brain computer interfaces

作者：Long Jinyi; Li Yuanqing^*; Yu Zhuliang

来源：Cognitive Neurodynamics, 2010, 4(3): 207-216.

DOI：10.1007/s11571-010-9114-0

• Electroencephalogram (EEG)
• Motor imagery
• Brain computer interface (BCI)
• Channel
• Frequency band
• Semi-supervised learning

Parameter setting plays an important role for improving the performance of a brain computer interface (BCI). Currently, parameters (e.g. channels and frequency band) are often manually selected. It is time-consuming and not easy to obtain an optimal combination of parameters for a BCI. In this paper, motor imagery-based BCIs are considered, in which channels and frequency band are key parameters. First, a semi-supervised support vector machine algorithm is proposed for automatically selecting a set of channels with given frequency band. Next, this algorithm is extended for joint channel-frequency selection. In this approach, both training data with labels and test data without labels are used for training a classifier. Hence it can be used in small training data case. Finally, our algorithms are applied to a BCI competition data set. Our data analysis results show that these algorithms are effective for selection of frequency band and channels when the training data set is small.

• 出版日期2010-9
• 单位华南理工大学