Apathy-related Neurobehavioral Markers of Cognitive Decline in Old-age Bipolar Disorders: Proof-of-concept

All participants will wear a wGT3X-BT actigraph (wGT3x-BT) for 4 days. Actigraphs are collected back at Day 4, after full 96 hours, when coming to the MRI platform. There, they will undergo 45 minutes MRI that acquire MRI signals to quantify degenerative, inflammatory, vascular and functional cerebral features.