A new review highlights how prolonged grief disorder (PGD) differs from typical grief and other conditions like PTSD, affecting about 5 percent of bereaved individuals. Researchers analyzed brain activity patterns to understand why some people remain stuck in intense mourning. The findings suggest distinct neural mechanisms that could aid in early identification and tailored treatments.
Prolonged grief disorder, recognized in the American Psychiatric Association’s diagnostic manual in 2022, has been the subject of debate for potentially pathologizing normal responses to loss. However, a recent analysis published in Trends in Neurosciences indicates it is a distinct condition. Led by Richard Bryant at the University of New South Wales in Sydney, Australia, the review compares brain activity in people with PGD to those with post-traumatic stress disorder (PTSD), depression, or anxiety following bereavement. It reveals overlaps but emphasizes more pronounced changes in reward-related brain circuits for PGD sufferers. For example, individuals with PGD exhibit significantly greater activation in the nucleus accumbens—a region involved in reward and motivation—when exposed to grief-related words or images. This activation correlates with self-reported yearning for the deceased. Unlike PTSD or anxiety, which promote avoidance, PGD shows a bias toward reminders of the lost loved one. Studies also note heightened activation in the amygdala and right hippocampus during exposure to death-related images, such as graveyards, while these areas deactivate more in response to positive stimuli like serene landscapes. This points to disrupted emotional regulation and reduced positive emotion capacity. Bryant explains that in PGD, the brain’s reward system “locks” onto the deceased, failing to find reward elsewhere, with the key difference from normal grief being the prolonged timeframe where adaptation does not occur. Katherine Shear at Columbia University notes that while neuroimaging offers insights, diagnosing PGD remains challenging due to grief's complexity and limited access to scans. Emerging approaches like “two-person neuroscience” examine brain activity in social interactions to account for context and support. One study found that greater connectivity between the amygdala and regions for planning and behavior inhibition shortly after loss predicts worsening symptoms. Joseph Goveas at the Medical College of Wisconsin stresses that early detection could enable interventions, from grief groups to specialized therapies. Recognizing PGD's unique neurobiology helps avoid misdiagnosis; it responds to grief-specific psychotherapies rather than antidepressants alone, though combining them addresses co-occurring depression.
