by Nita A. Farahany

The era of brain surveillance has begun. Advances in neuroscience and artificial intelligence are converging to give us an affordable and soon-to-be widely available generation of consumer neurotech devices—a catchall term for gadgets that, with the help of dry electrodes, connect human brains to computers and the ever-more-sophisticated algorithms that analyze the brain-wave data.

Neuroscientists wrote off earlier iterations of consumer neurotech devices as little better than toys. But as both the hardware and the software have improved, neurotechnology has become more accurate and tougher to dismiss. Today, the global market for neurotech is growing at a compound annual rate of 12% and is expected ...

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