Coping After Loss Through Mindfulness in Adults With Prolonged Grief Disorder

Inclusion Criteria: * Must have lost a loved one (spouse, romantic partner, parent, child, sibling, close friend) * Must have a score \>29 on the Inventory of Complicated Grief (ICG) * Clinical diagnosis of Prolonged Grief Disorder as assessed by the Structured Clinical Interview for Complicated Grief (SCI-CG) Exclusion Criteria: * History of a lifetime clinical diagnosis of schizophrenia * History of a lifetime clinical diagnosis of bipolar disorder * History of a lifetime clinical diagnosis of a psychotic disorder * Current diagnosis of substance or alcohol use disorder within the past 12 months * History of a neurologic disease, seizures, stroke or head injury resulting in prolonged loss of consciousness and/or neurological sequelae * Current pregnancy as assessed by a urinary pregnancy test at screening during the Screening (week -4 until 0), Baseline (week 0) or Endpoint visit (week 8), or lack of use approved methods birth control for women of childbearing age * Currently practice of mind-body techniques at least once a week (e.g., yoga) in the past 3 months * Currently undergoing concomitant psychotherapy for grief (any psychotherapy) * Left-handedness * Current use of medications that would affect cerebral metabolism * Any contraindications to Magnetic Resonance Imaging (MRI) * Being under legal guardianship