Fig. (4) Visual representation of the electrode combinations (indicated by squares) corresponding to the best classification rate achieved for actors’ actions and observers’ observations and for the two sub-regions SR-1 and SR-2 (regions within the thick dashed and dotted lines, respectively). Electrode combinations for the best classification rate achieved for actors’ actions: (a) in the time window -6 to 146 msec for SR-1, and (b) in the time window -6 to 500 msec for SR-2, using both the ANN classifier with cross validation. Electrode combinations for the best classification rate achieved for observers’ observations: (c) in the time window -6 to 700 msec for SR-1 using the ANN classifier with cross-validation, and (d) in the time window -6 to 500 msec for SR-2 using the FCM method.