Chronic Anergic Depression IDentification - Magnetic Resonance Imaging Exploration in the Elderly of Traits Related to Onset

"2 MRI examinations will be carried out on a Siemens Vida® MRI ( Siemens®, Erlangen, Germany) 3 Tesla. During this study, no MRI examination requires the injection of a contrast agent.~Different sequences, according to several acquisition modalities, will be performed during each MRI. The structural sequences (T1 and T2, MPRAGE) will highlight any lesions in the form of atrophies and/or vascular lesions in the participants, also subject to inter-individual differences. The examination will also involve a quantitative multiparametric acquisition with 8 modalities (R1, R2, Radial and Axial Diffusion in Diffusion Tensor, dispersion, orientation and density index of neurites by NODDI, the Macromolecular Proton Fraction, measurement of magnetic susceptibility and R2\*) to characterize tissue properties. Functional imaging (in resting state, during film viewing and performance of cognitive tasks in ASL, BOLD and multiband) will allow analysis of the primary endpoint - functional connectivity,"