A neurobiological perspective on prolonged grief disorder

Prolonged grief disorder (PGD) is a psychiatric condition that describes individuals who experience persistent grief reactions characterized by preoccupation with the loss. This review provides an overview of the evidence on neurobiological processes associated with PGD. We propose that, although the neurobiological circuitry of PGD overlaps with that of anxiety and depression, it also involves neural responses that reflect the distinct symptom profiles of people with PGD. Specifically, while recruitment of cognitive control and salience networks is observed across common mental disorders, there is evidence that aberrant neural processes implicated in reward processes and appetitive functions are somewhat distinctive to PGD. We emphasize that methodological limitations suggest caution is needed in interpreting current evidence, and more rigorous research is required to delineate key distinct neurobiological processes of PGD.