FIGURE 4 | The maximum accuracy of successful memory classification by simple SVM using the pre-stimulus interval [ (A): − 0.5–0 s] and during-stimulus interval [ (B) : 0–1 s]. The x-axis indicates subjects, and y-axis indicates the classification accuracy (%). The chance level is 50% (dashed line). The dark gray bars in both (A) and (B) indicate the average accuracy. Error bars indicate the standard error of the