An interesting body of scientific work exists to investigate the question of whether or not various forms of electromagnetic stimulation can improve tissue function, particularly in older people. To improve neurogenesis in an aging brain, or enhance nerve regrowth following injury, for example. Taken broadly, the manipulation of cells to specific ends via electromagnetism is far less studied than is the case for the use of small molecules, however, and this is very evident in the character of the data.
Picking any one approach to electromagnetic therapy at random, one tends to find unpromising results, when taken as a whole, meaning a few flashes of claimed success amidst a great deal of failure. There is reason to believe that the fine details of equipment, experimental setup, duration of treatment, and frequency of electromagnetic radiation are all important, and that perhaps consistent success is a matter of finding the right combination for a given application. That may or may not be the case.
Transcranial direct current stimulation has the merit of having perhaps fewer important variables to adjust in terms of how the treatment is delivered, which might explain why
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