Group 1: Patients suffering from obesity, seeking bariatric surgery, and with BED.  Inclusion criteria:  Patients between 18 and 60 years old, men or women, right-handed Having a diagnosis of obesity class 2 or 3 and seeking bariatric surgery With Binge eating disorder (BED) Possibility to the use of MRI Patients being a native French speaker Patients enrolled in the national healthcare insurance program Patients consenting to participate to the study  Exclusion criteria:  The presence of a current substance use disorder as defined by DSM-5 criteria The presence of neurological disorders or head trauma The presence of any intellectual disability, of pervasive developmental disorders or learning difficulties (especially of dysphasia and dyspraxia) A current mood episode as defined by DSM-5 criteria A diagnosis of schizophrenia or of bipolar disorder according to DSM-5 criteria Handling of psychotropics substances A sensorial impairment uncorrected (visual and/or hearing) Contraindication to the use of MRI Pregnant woman and people particularly protected by the law  Group 2: Patients suffering from obesity, seeking bariatric surgery, and without BED.  Inclusion criteria:  Patients between 18 and 60 years old, men or women, right-handed Having a diagnosis of obesity class 2 or 3 and seeking bariatric surgery Without Binge eating disorder (BED) Possibility to the use of MRI Patients being a native French speaker Patients enrolled in the national healthcare insurance program Patients consenting to participate to the study  Exclusion criteria:  The presence of a current substance use disorder as defined by DSM-5 criteria The presence of neurological disorders or head trauma The presence of any intellectual disability, of pervasive developmental disorders or learning difficulties (especially of dysphasia and dyspraxia) A current mood episode as defined by DSM-5 criteria A diagnosis of schizophrenia or of bipolar disorder according to DSM-5 criteria Handling of psychotropics substances A sensorial impairment uncorrected (visual and/or hearing) Contraindication to the use of MRI Pregnant woman and people particularly protected by the law  Group 3: Healthy participants.  Inclusion criteria:  Men or women, right-handed, between 18 and 60 years old Without overweight nor obesity Native French speaker Individuals enrolled in the national healthcare insurance program Individuals consenting to participate to the study  Exclusion criteria:  Past obesity The presence of neurological disorders or head trauma The presence of any intellectual disability, of pervasive developmental disorders or learning difficulties (especially of dysphasia and dyspraxia) Handling of psychotropics substances A sensorial impairment uncorrected (visual and/or hearing) Contraindication to the use of MRI Pregnant woman and people particularly protected by the law A current mood episode as defined by DSM-5 criteria A diagnosis of schizophrenia or of bipolar disorder according to DSM-5 criteria The presence of a current substance use disorder as defined by DSM-5 criteria A diagnosis of eating disorder as defined by DSM-5 criteria