Change in true positive rate (TPR), false positive rate (FPR), and area under the ROC curve (AUC) during the avatar-control training period. The lines indicate the change of TPR (A), FPR (B), and AUC (C) for a total of 9 training days. The TPR and FPR values corresponding to the best threshold for the solid ROC curves shown in Fig. 2 was extracted. The solid lines represent the left-hand IM and the dotted lines represent the right-hand MI.