Improving single-hand open/close motor imagery classification by error-related potentials correction

Objective: The ability of a brain-computer interface (BCI) to classify brain activity in electroencephalograms (EEG) during motor imagery (MI) tasks is an important performance indicator. Because the cortical regions that drive the single-handed open and closed tasks overlap, it is difficult to classify the EEG signals during executing both tasks.Approach: The addition of special EEG features can improve the accuracy of classifying singlehand open and closed tasks. In this work, we designed a hybrid BCI paradigm based on errorrelated potentials (ErrP) and motor imagery (MI) and proposed a strategy to correct the classification results of MI by using ErrP information. The ErrP and MI features of EEG data from 11 subjects were superimposed.Main results: The corrected strategy improved the classification accuracy of single-hand open/ close MI tasks from 52.3% to 73.7%, an increase of approximately 21%.Significance: Our hybrid BCI paradigm improves the classification accuracy of single-hand MI by adding ErrP information, which provides a new approach for improving the classification performance of BCI.