Entrepreneurs are starting to get in on the action. A company called foc.us has already planted a flag with a commercial brain-stimulation headset released last year. It’s marketed as a gadget for videogamers looking to improve their skills, thus skirting the need for FDA approval. The first batch of 3,000 sold out in just a few months. So did the second.
With easy access to the research, the equipment, and each other, self-experimenters aren’t consulting their doctors or waiting for scientific...
