Inclusion Criteria:

• Participant with PWS: Age : ≥ 18 years old; Diagnosis of Prader-Willi syndrome with identified genotype; Intellectual Quotient ≥ 55 measured by WAIS-IV (abbreviated version); Pathological or threshold score on at least one of the BRIEF-A subscales; Adults volunteering and able to comply with study procedures; Signature of informed consent form; Beneficiary of a social security regime
• Caregivers: Caregivers involved in the participant's family, medical or institutional environment; Caregiver who has signed the informed consent form.

Exclusion Criteria:

• Participant with PWS: Untreated and unstabilized psychiatric and/or behavioral disorders (psychological decompensation within the last year); Severe visual or hearing impairment; Untreated sleep apnea syndrome; Epileptic seizures; Previous significative ECG abnormality; Adults with pacemakers or defibrillators; Metal or electronic devices implanted in the head; Participation in other research involving an exclusion period still in progress at inclusion; Score ≥ 30 indicating severe depression (BDI-II self-report questionnaire); Pregnant or breast-feeding women.