Apathy in Late Life Depression: New Biomarkers Using Actimetry and Magnetic Resonance Imaging

This scale is used to rate the severity of extra-pyramidal symptoms (akinesia, rigidity and tremors). These symptoms may be the cause of reduction of motor activity apart from any reduction in motivation, they onstitute a confounding factor that it should be controlled.

This is a structured interview that allows rapid screening in about 20 minutes of troubles Psychiatric. It is based on short questions to which the patient must answer yes or no and on a decision tree. Patients must validate clinical diagnoses of depression.

This scale is composed of 10 items from 0 to 6 from a semi-structured interview, to obtain a total depression score of 0 to 60 (0 no depression, 60 maximum intensity of depression).

heterosexual assessment that rates the severity of symptoms suicidal and changes in suicidal symptoms. Any subject with a score greater than 4 is not included.

The clinical criteria make it possible to make a diagnosis of apathy with a functional repercussion. It is based on a lack of motivation felt by the patient, causing a functional or social impact that is not the consequence of a disturbance of consciousness or a disability engine. The cognitive, emotional and behavioral dimensions are affected.

The patient is timed to walk 10m. A speed \<1m / sec is a criterion exclusion because it shows severe sarcopenia and constitutes a bias.

accelerometer presentation and pose

withdrawal of the accelerometer and data acquisition from the accelerometer

clinician version and near-helping version. It's a hetero rating scale from an interview semi structured by a trained clinician. It assesses cognitive, emotional and behavioral apathy than three items of various apathy. The total score ranges from 18 (total absence of apathy) to 72.

To date, there is no valid fatigue scale in the depression of the elderly subject, a fortiori in French. The fatigue scale in adult depression includes has been validated with an EVA (Visual Analogue Scale) (38). We therefore propose to use this type of evaluation to control this aspect.

* Modified Card Sorting Test MCST(Modified Card Sorting Test) (Wisconsin Test): This test assesses conceptualization, attention and mental flexibility using a deck of cards. * Trail Making Test (TMT): This test is used to assess mental flexibility. * Fluences verbal: This test tests the capacities of setting up search strategies in memory semantics and oral language. * Stroop Paradigm: This test is used to evaluate the resistance to interference, ie the patient's ability to inhibit some over-learned and automated responses.

An MRI lasting 30 minutes is programmed

This is a self-questionnaire of 18 items, each side on a 5-level Likert scale (0: not everything at 4: very often). It differentiates between "behavioral" apathy and "social" apathy. "Emotional".