Behavioural disorders are very common right from the initial stage of dementia and contribute to loss of autonomy. Behavioural dysexecutive disorders have a particular status due to their prevalence and their diagnostic importance, as they often constitute the initial symptoms of Frontotemporal Dementia (FTD), Semantic Dementia (SD) and Huntington's disease (HD) and they are classically more frequent in vascular dementia (VaD) than in Alzheimer's disease (AD). The presence of these disorders at the stage of Mild Cognitive Impairment (MCI) has only been partially evaluated and would increase the risk of progression to dementia. These classical data are based on non-standardized assessments and non-validated diagnostic criteria. The Groupe de Reflexion pour l'Evaluation des Fonctions EXécutives (GREFEX) has developed a standardized assessment tool for behavioural dysexecutive disorders, the Behavioural Dysexecutive Syndrome Inventory (BDSI) and has validated diagnostic criteria for this syndrome.

Inclusion Criteria:

• Support to the consultation memory for a neurological disease ( frontotemporal dementia , vascular dementia , Alzheimer's disease , mild cognitive disorder, Huntington's disease ( with genetic diagnosis confirmed : number of CAG triplets > 36 symptomatic : UHDRS score ≥5 ) with MMS > 15
• Age 40 to 85 years
• French
• Informing reliable
• Agreeing to participate in the study.

Exclusion Criteria:

• Presence of other disease disturbing behavior ( current depressive syndrome , schizophrenia, psychosis , past psychiatric disorders requiring a stay > 2 days in a specialized environment ) or cognition (mental retardation , illiteracy , respiratory failure, kidney , liver , heart ) or preventing the realization of the tests ( perceptual or motor deficit ) intrecérébrale pacing therapy or stem cell transplant , patient protected ( under supervision or guardianship ) , pregnant and / or breastfeeding and lack of consent

French-speaking subjects between the ages of 40 and 85 years with an MMSE score > 15/30, followed for AD or MCI or VaD or FTD or SD or HD will be selected by their neurologist during a routine memory assessment visit.