Overview

Anorexia nervosa is a predominantly female eating disorder that most often appears in adolescence. The latter leads to strict and voluntary food deprivation for several months or even years. The lifetime prevalence of anorexia is 1.4% in women and 0.2% in men.

Ultimately, only half of people treated for anorexia nervosa in adolescence recover, 30% simply improve, 21% suffer from chronic disorders and 5 to 6% die. At the same time, between a quarter and half of patients abandon their current treatment, including during hospitalization. Relapses occur during the evolution of anorexia nervosa. Even more worrying, mortality is highest the year following the patient's discharge from hospital. This appears to be due to somatic complications in more than half of cases (most often cardiac arrest), to suicide in 27% of cases.

Researchers are still trying to clarify the mechanisms involved in the emergence and persistence of this disorder. The objective is to obtain more verified and faster cures. However, the obstacles to successful treatment are mainly due to the denial of disorders and thinness.

From a neurocognitive perspective, the representation one has of one's body is underpinned by two types of representations, i.e. body image and body schema.

It has long been shown that body image is altered in anorexia nervosa. More recently, authors have shown that the distortion of the body representation was however more extensive and also affected the body schema. Patients find themselves too fat despite obvious thinness and move through space as if this were really the case.

Worryingly, these distortions in bodyschema seem to persist after therapeutic management. Despite the potential role of body-scheme distortions in maintaining the disorder, as well as the risk of relapse, the difficulties in assessing body-scheme are significant. Indeed, recovery in these pathologies is often determined according to the Body Mass Index, self-declaration and questionnaires evaluating body image, again limiting the verification of the resorption of distortions in the body schema.

Investigators have therefore developed the systematic, ergonomic and simplified evaluation of the body schema in patients suffering from anorexia nervosa at the time of diagnosis in an expert center, but also during follow-up evaluations thanks to the use of an evaluation platform of the body schema, i.e. the body in brain platform, developed by the LIP/PC2S laboratory and the SATT Linksium which allows the evaluation of the body schema.

Eligibility

Inclusion Criteria:

• Patient over 15 years old
• Women
• Patient with a BMI <18.5
• Patient suffering from anorexia nervosa (DSM V, 2013)
• Patient agreeing to participate in the study with signed informed consent (Or whose parents/holder of parental authority have signed the informed consent)
• Patient affiliated to a Social Security plan or beneficiary of such a plan

Exclusion Criteria:

• Adult patients protected by a legal protection measure (guardianship, curatorship, etc.)
• Patients participating in another research that may interfere with this research
• Patients with acute and co-occurring psychiatric comorbidities (suicidal crisis, delusions)
• Patients not fluent in French
• Pregnant, parturient or breastfeeding women (on questioning of the patient)
• Persons deprived of their liberty by a judicial or administrative decision
• Persons admitted to a health or social establishment for purposes other than research
• Patients with any current pathology or history of psychotic disorders, migraine, epilepsy, balance disorders, vertigo, visual disorders, proprioceptive disorders and/or neuromuscular disorders.