II. MATERIALS AND METHODS
A. Participants
Thirty healthy students from the school of biomedical engineering (15 males and 15 females aged between 20 and 25 year old) were asked to participate in this study. None of the participants had a previous history of neurological, psychiatric, or other severe disease that may otherwise influenced the experimental results. Each participant provided written informed consent prior to participating in the study. In addition, participants had no previous experience on intelligence quotient (lQ) adult Raven tests.