Functional Magnetic Resonance Imaging in Patients With Obstructive Sleep Apnea Syndrome

Inclusion criteria : 1. OSAS patients * severe OSAS with an Apnea-Hypopnea Index (AHI) \> 30/h * without CPAP treatment 2. Non-OSAS patients * absence of OSAS (AHI \< 15/h and absence of excessive daytime sleepiness with Epworth score \<11) Non-inclusion criteria : * \< 18 years old * \>75 years old * left-handed * BMI\> 40 kg/m² * another sleep disorder * central component of sleep apnea syndrome (central apnea index\> 5 / h) * current or past neurological pathology * respiratory pathology (obstructive ventilatory disorder, restrictive ventilatory disorder, hypercapnia) * MRI contraindication (metallic foreign body, claustrophobia, pregnant woman, etc.) * taking drugs that can modify the BOLD signal on MRI (psychotropic drugs, vasodilators, vasoconstrictors, etc.), * uncorrected sensory impairment (vision or hearing) * protected by law. Exclusion criteria : * pregnant woman according to the positive beta-hCG test result * left-handed following the laterality questionnaire * MINI results showing: * a current mood episode * a current disorder of the use of psychoactive substances or in the last 6 months (excluding tobacco) * an eating disorder * a diagnosis of bipolar disorder, current or past schizophrenia