Inclusion Criteria:  Male Age between 20 to 45 years old Weight between 50 to 90 kg No psychiatric or neurologic pathological history No cranial trauma history with loss of consciousness No juridical protection Free and informed consent Affiliated with a social security scheme or similar  Exclusion Criteria:  Subject with present or past dependence on alcohol or any other addictive substance according to the DSM-IV-TR criteria, with the exception of nicotine, caffeine and cannabis Subject already participating in another biomedical research project or having participated for less than a year in a study using ionizing radiation Subject with a contraindication to MRI exams Subject with a contraindication to PET scans using [18F] F13640: hypersensitivity to the active substance or to one of the excipients (sodium chloride) Subject with a contraindication to sumatriptan Patients with an active infectious disease or associated serious and progressive medical pathology Subjects with an inability to understand or carry out the study (language barrier, obvious lack of motivation, etc...) as judged by the investigator Patient having exceeded the annual amount of compensation authorized for participation in research protocols.