Inclusion Criteria:  Male, 18-30 years old, right-handed, with normal hearing and normal visual or corrected acuity;  Exclusion Criteria:  Have history of smoking, alcohol abuse, no history of neurological or psychiatric disorders (e.g., epilepsy), no relevant family history, and no recent medication use; Have history of surgery for head injury, no metal implants in the body (including braces); Sleep-wake time irregular， with sleep disturbance; Have history of noise allergy; Participate in similar psychological experiments during 2 months.