Inclusion criteria for patients:  Aged from 15 to 25 years Subject meeting the Ultra High Risk criteria at CAARMS and / or SPI-A Signature of the consent (participants and parents for minors) Subject affiliated to the social security scheme or benefiting from such a scheme  Inclusion criteria for healthy volunteers:  Aged from 15 to 25 years Subject not familiar to the patient to whom it is matched Signature of the consent (participants and parents for minors) Subject affiliated to the social security scheme or benefiting from such a scheme  Exclusion Criteria for both patients and healthy volunteers:  History of epilepsy and / or migraine (due to the epileptogenic potential of light stimuli) Refusal of participation of the minor even if the legal representatives want the subject to participate in the study Claustrophobia Wearing glasses Abnormal right and left visual acuity without contact lenses Distinctive signs on the face which cannot be temporarily removed Subject under legal protection (curators / guardianship) or deprived of liberty