News Depression and Mental Health News Blog Study Probes Roots of Fearful Memories | Study Probes Roots of Fearful Memories |
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New research is helping scientists understand why frightening,
traumatic memories go so deep and linger so long in the human brain.
A study in rats shows that a powerful neurochemical called norepinephrine is released to help the brain deal with trauma -- but it also "imprints" an emotional fear tagged to the memory of that event. These emotionally loaded memories could help cause post-traumatic stress disorder (PTSD), said a team at Harvard University. But the findings may also provide a target for treatment, they added. "Norepinephrine is released in a part of the brain called the amygdala, which is associated with emotional conditions, particularly in bad situations," said lead researcher Vadim Bolshakov, director of the Cellular Neurobiology Laboratory at Harvard-affiliated McLean Hospital, in Belmont, Mass.
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