Self and Autobiographical Memory in Dementia With Lewy Bodies and Alzheimer Disease: a Behavioral and Multimodal Neuroimaging Study

Inclusion Criteria: Inclusion criteria for all participants: * Male or female aged between 60 to 80, at the inclusion visit * Right-handed * Must be affiliated to a social health insurance protection scheme * Must be able both to understand the objectives and risks related to the study and to give a dated and signed informed consent * Fluency in French * At least 9 years of formal education Inclusion criteria for group of dementia with Lewy bodies: * Subject meeting McKeith et al. criteria (2017) * Subject with prodromal dementia with Lewy bodies meeting the DSM-V Mild Cognitive Impairment criteria (2013) * Subject with prodromal or mild dementia with Lewy bodies with an ≤ 20 MMSE score * Availability of a caregiver for the inclusion visit Inclusion criteria for group of Alzheimer disease: * Subject meeting Dubois et al. criteria (2014) * Subject with prodromal or mild Alzheimer disease with an ≤ 20 MMSE score * Availability of a caregiver for the inclusion visit Inclusion criteria for healthy elderly: * Subject must be matched with patients in terms of age, gender and educational level * Absence of any cognitive complaint * Autonomy must be preserved Exclusion Criteria: Subjects with significant neuropsychiatric comorbidities * Abnormal neurological examination * Sensory impairment that may significantly interfere with testing * Contraindication to MRI * Claustrophobia * Heavy psychotropic drug treatment * Excessive and regular consumption of alcohol * Subject in period of exclusion (determined by a previous or ongoing study) * Inability to give the subject informed information * Subject under judicial protection * Subject under tutorship or guardianship