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TMS is repetitive transcranial magnetic stimulation in which a metal coil is placed on the scalp to generate a magnetic field, which in turn produces an electric current that induces depolarization in the neurons. Basically, normally the membrane of a neuron or cell is polarized or has a negative charge, so depolarizing is moving the charge to neutral.
This involves daily treatments that are administered over several days. Available studies do show that this kind of repetitive stimulation on the cortex, the outermost layer of the brain, is of great help in treating “Unipolar Depressions” that do not respond to drug therapy. I hope this short explanation helps.
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Maybe you have more recent data; my experience was thirty years ago. Perhaps there is some distinction between magnetic and electrical stimulation; the gadget I was required to use was electrical. According to James Clerk Maxwell, one partakes of the other. Anyway, I appreciate your agreement that I was entitled to assurance that I was doing right by the patient.