20 healthy right-handed undergraduate Han Chinese subjects with no history of neurological or psychiatric disorder (Mage = 22.0, SD = 2.07; 9 males) were recruited to participate in the experiment. All subjects provided written informed consent and were paid according to their performance in the experiment. The study was approved by the ethics committee of Southwest University (China) and the Institutional Human Participants Review Board of the Southwest University Imaging Center for Brain Research. The methods were carried out in accordance with approved guidelines.
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