Algorithm 3 The analysis of CCS in the participant group

input: object EEG data of the participants output: the ranked channels of the participant group 1.0.5 s GVS period data are divided into different groups according to different tasks; 2.The correlation coefficient vector of each task is calculated separately; 3.The correlation coefficient vector of all the tasks are synthesized, and the mean value of each channel is calculated to obtain the average correlation coefficient vector; 4.The average correlation coefficient vector across the participants is synthesized and ranked in descending order, and the common descending ordered channels are obtained; 5.According to the descending order, the same evaluation of channel optimization is conducted, and the decoding results are saved for subsequent comparison.