In this study, 40 right-handed young adults (20 males and 20 females), age between 22 to 25 years (the mean age was 23 ± 2 years old) with no history of neurological diseases, were recruited from National Chiao Tung University, Taiwan. All participants provided written informed consent. The study was in accordance with the latest version of the Declaration of Helsinki, and approved by the Institutional Review Board (IRB) in National Chiao Tung University, Taiwan.
