A neurosurgeon at the University of California, San Francisco, Dr. Starr was treating people with Parkinson's disease, which slowly destroys essential bits of brain tissue, robbing people of control of their bodies. At first, drugs had given his patients some relief, but now they needed more help.
After the surgery, Dr. Starr closed up his patients' skulls and switched on the electrodes, releasing a steady buzz of electric pulses in their brains. For many patients, the effect was immediate.
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