Eligibility  Study A :  Minimum age : 18 Years Maximum Age : 50 Years Sex : women or men  Inclusion Criteria :  Normal Body Mass Index (18-25), Right-handlers Affiliated to a social security scheme Having given a free, informed and written consent  Exclusion Criteria :  Related to the study - Insufficient command of French  Related to Magnetic Resonance Imagine  Implantable cardiac pacemaker or defibrillator; Neurosurgical clips; Cochlear implants; Neural or peripheral stimulator; Foreign orbital or brain metallic foreign bodies; Endoprostheses implanted for less than 4 weeks and osteosynthesis materials placed for less than 6 weeks; Claustrophobia. Related to near infra Red spectroscopy Hairs that do not allow proper near infra Red spectroscopy measurement upon ligh blockage  Study B  Minimum age : 18 Years Maximum Age : 25 Years Sex : women  Inclusion Criteria :  Normal BMI (18-25), Right-handlers Affiliated to a social security scheme Having given a free, informed and written consent Based on emotional overeating questionary : having emotional overeating episodes > 6 days in a month for at least one negative emotion  Exclusion Criteria :  Related to the study  Insufficient command of French Excessive consumption of alcohol or other psychoactive substances (determined on the basis of the Alcohol Use Disorders Identification Test questionnaires - excluded if score > 12 and "Car, Relax, Alone, Forget, Friends, Trouble" questionnaire - excluded if score> 1 " yes ") Eating disorders ("sick, control, one stone, fat, food" questionnaire >2) Food addiction (Yale Food Addiction Score 2.0, score >2 With psychoactive treatment Digestive or gastric disorders  Related to magnetic resonance imaging  Implantable cardiac pacemaker or defibrillator; Neurosurgical clips; Cochlear implants; Neural or peripheral stimulator; Foreign orbital or brain metallic foreign bodies; Endoprostheses implanted for less than 4 weeks and osteosynthesis materials placed for less than 6 weeks; Claustrophobia.  Related to near infraRed spectroscopy  - Hairs that do not allow proper near infraRed spectroscopy measurement upon ligh blockage