Figure 1

nature的文章用的此种分类 相信比较权威  就这样吧

Seventy-two of 128 electrodes were divided into four groups (frontal, central, parietal, and occipital) for each hemisphere. Each group contained between 16 and 20 electrodes that were averaged together to represent EEG responses from that scalp region. The remaining channels around the perimeter of the net were excluded from analysis to avoid artifacts resulting from muscle activity in the face and neck, and channels along the midline were removed to allow for comparison between hemispheres.