Two sessions will be scheduled for every subject: one placebo and one chlorpromazine session, with at least one week interval. During placebo sessions, 3ml NaCl 0.9% will be administered i.v. with an identical syringe as the one used for i.v. chlorpromazine administration. Sessions will run in a double-blind randomized-controlled way. The order of placebo and chlorpromazine administration will be randomized by an online randomization tool (http://www.randomization.com/). The randomization scheme will be carried out by an experienced independent researcher or study nurse, this person will prepare and inject chlorpromazine or placebo. In this way, the investigator performing the actual study and data analysis will be blinded until termination of the study.