Inclusion criteria for patients:  18 to 65 years of age, Suffering from a severe psychiatric disorder (psychotic disorder, mood disorder (depressive and bipolar disorders), anxiety disorder, autism spectrum disorder and eating disorder), Benefiting from cognitive phenotyping (neuropsychological assessment and possibly EEG) as part of the initial assessment for a severe psychiatric disorder, proven non-opposition to participation in the study, ability to perform cognitive tests: speaking and understanding French easily, presence of an identified support person, absence or presence of a property protection measure such as curatorship or guardianship  Inclusion criteria for healthy volunteers:  ages 18 to 65, proven non-opposition to participating in the study, ability to perform cognitive tests: able to speak and understand French  Exclusion criteria:  impossible to collect information on exposure (subjects recently arrived in France, foreign language ...), history of coma, epilepsy, head trauma with loss of consciousness over 10 minutes, scalp pathology, subject included in another clinical and/or therapeutic experiment in progress involving the testing of a therapeutic treatment or a drug treatment, opposition to participation in research, inability to perform cognitive tests: non-psychiatric (somatic) condition likely to affect cognitive abilities, sensory or peripheral motor deficits, clinical condition in acute phase (agitation, altered consciousness), protection of property measure such as safeguard of justice, For healthy volunteers only: past or current severe psychiatric disorder (psychotic disorder, mood disorder (depressive and bipolar disorders), anxiety disorder, autism spectrum disorder and eating disorder).