Measurable end points/statistical power of the study To detect the change in impulsivity and empathy resulted from the iTBS intervention, G*Power 3.1.9.2 was used to estimate sample size required in consideration of interaction effect (impulsivity group × iTBS conditions) of repeated measure ANOVA. The following parameters were selected: effect size f = 0.20 (equivalent to d = 0.40, estimated from the results of previous meta-analyses), alpha error probability = .05, power = (1- β error probability) = .80, number of groups = 2, number of measurements = 2 and correlation among repeated measurements = 0.6. A minimum of total sample size of 42 subjects will be required. Considering the dropout rate of 0.20 (according to previous rTMS studies), 54 subjects will be required for the study, including 27 high impulsivity participants and 27 low impulsivity participants.