Cognitive Biases Under Ketamine

Inclusion Criteria:

* Right-handed (as assessed by the Edinburgh scale)
* Aged 18 to 39
* Having given an informed consent
* Health insurance

Exclusion Criteria:

* Pregnant or breastfeeding woman (a urine pregnancy test will be offered in doubt)
* Personal or first-degree family history of psychosis
* Personal history of mood disorder, anxiety disorder, obsessive-compulsive disorder, somatoform disorder, dependence on a psychoactive substance, behavior disorder incompatible with a 2 hours EEG recording.
* Psychotropic treatment, current or stopped for less than 1 month, including antidepressant, anxiolytic but excluding hypnotic treatments.
* Personal history of neurologic disorder in relation to the central nervous system : congenital malformation of the brain, brain tumor, multiple sclerosis, degenerative disease of the central nervous system, epilepsy, current or in remission for less than 3 years or still requiring a medical treatment, inflammatory disease of the central nervous system dating under a year or having resulted in sequelae.
* Known hypertension or blood pressure above 140/90 mmHg upon clinical examination, congenital heart disease, ischemic heart disease, cardiac insufficiency, supraventricular and ventricular heart rhythm disorder.
* Person with restricted liberty, as a result of judicial or administrative measures
* Persons under involuntary commitment as a result of a psychiatric disorder.
* Person subject to a measure of legal protection or unable to consent.
* Known intolerance ketamine.