Scientists typically control the behavior of a lab mouse by enticing it with food or repelling it with puffs of air. When I gathered with my colleagues in a Stanford University lab, however, we had a more direct way: We took command of its brain with a shining light. Implanted in that mouse’s brain was a device about the size of a peppercorn. When we used our wireless power system to switch it on, the device glowed with a blue light that activated genetically engineered brain cells in the premotor cortex...
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