marginally significantp = 0.06
Simple effect analysis showed that significant or marginally significant differences between the valid and invalid locations occurred at electrodes P4, P7, and P8 (P4v-i = − 0.507 μV, p = 0.06; P7v-i = − 0.506 μV, p < 0.01; P8v-i = − 0.538 μV, p < 0.05), and a significant maximum difference between the valid and invalid locations was found in the P8 electrode (− 0.538 μV).