Inclusion Criteria:  Right-handed Aged 18-60 years German native speaker Informed consent Normal or corrected sight  Exclusion Criteria:  Current pregnancy Current or history of general medical, neurological or psychological disorders, which preclude sulpiride intake Self-reported presence of mental disorders Liver, kidney, and bowel disorders Regular smoking Reported alcohol abuse Illegal drug intake Regular drug intake by prescription in the past three months Dreadlocks BMI < 19 or > 30 Unremovable metal objects around the head Previous knowledge of Japanese characters Excessive caffeine intake (> 8 cups per day)