Your temples throb as you enter the pharmacy. For months you have been battling daily migraine headaches. You have tried your doctor's every suggestion—drinking more water, changing your diet, getting extra sleep—and downing a host of pain pills. Now you are armed with a prescription for a totally different kind of treatment.
The pharmacist guides you to a shelf of headgear, labeled with different brain regions. She fits you for a cap, the underside of which features thin conductive metal strips, called electrodes, coated in adhesive gel to stick gently to your scalp. The electrodes link to a slim cable that dangles from the back of the cap. She then hands over the key component of your prescribed medication: an electric stimulator.
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