Researchers at The Hospital for Sick Children (SickKids) in Toronto, Canada, have made a significant breakthrough by uncovering how stress alters the encoding and retrieval of aversive memories in the brain. Their latest study, published in the prestigious journal Cell, introduces a promising new approach that could help patients with Post-Traumatic Stress Disorder (PTSD) regain normal memory specificity.
In this study, the team delves into the biological mechanisms behind stress-induced aversive memory generalization and proposes an intervention that holds promise for restoring appropriate memory specificity in PTSD patients.
Through a preclinical model study, participants were exposed to acute but safe stress before encountering aversive events, leading to the formation of non-specific fear memories. These memories could be triggered in safe contexts unrelated to the original event, mirroring manifestations seen in patients with PTSD.
Subsequently, researchers analyzed the participants' brain memory traces—the physical representations of memories in the brain. Typically, memory traces involve a small number of neurons, but stress-induced memory traces engage a larger network of neurons. This expansion of traces results in the generalization of fear memories, which may be reactivated even in safe environments.
Furthermore, the study revealed that stress boosts the release of endocannabinoids, which disrupt the function of intermediate neurons that normally limit the size of memory traces. By blocking endocannabinoid receptors on these intermediate neurons, researchers believe it could effectively prevent one of the most debilitating symptoms of PTSD.
Tags
A study published in Nature has uncovered a new mechanism for how the brain stores emotional memories—one that centers not on neurons, but on astrocytes, the star-shaped glial cells once…
When people experience striking events, not only do those moments become etched in memory, but even seemingly ordinary experiences that occurred shortly before can become unusually vivid. The neural mechanism…
Researchers from the University of California, Los Angeles, and Columbia University have discovered that neurons in the brainstem's locus coeruleus act like a “memory reset button”, segmenting continuous experiences into…
Stress has become a pervasive issue in modern society, with chronic stress now recognized as a leading contributor to major causes of death, including heart disease, cancer, stroke, respiratory illnesses,…
Researchers at the University of Pennsylvania have identified a group of neurons in the hypothalamus that may play a key role in stress-induced sleep and memory disturbances. Published in The…
A new study published in the journal Occupational & Environmental Medicine suggests that prolonged overwork may alter brain structure, potentially impairing emotional regulation and executive functions such as working memory…
