Washington: An implanted electronic stimulator is commonly used to treat severe depression in people who don`t respond to standard antidepressant therapy, but little is known about how this stimulation works.Now, preliminary brain scan studies conducted by researchers at Washington University School of Medicine in St. Louis are beginning to reveal the processes occurring in the brain during stimulation and may provide some clues about how the device improves depression.They found that vagus nerve stimulation brings about changes in brain metabolism weeks or even months before patients begin to feel better.
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