Before revision:  Our findings indicated that the audiovisual stimuli improved the performance of the RSMP BCI, and that the late positive potential (LPP) at Pz contributed to classification accuracy  .
After revision:  Our findings indicated that the audiovisual stimuli improved the performance of the RSMP BCI, and that the late positive potential (LPP) at Pz contributed to classification accuracy . Online accuracy of BCI reached 85.7+-11.5\% .