When you hear the word “neurotechnology,” you may picture Black Mirror headsets prying open the last private place we have — our own skulls — or the cyber-samurai of William Gibson’s Neuromancer. That dread is natural, but it can blind us to the real potential being realized in neurotech to address the long intractable medical challenges found in our brains. In just the past 18 months, brain tech has cleared three hurdles at once: smarter algorithms, shrunken hardware, and — most important — proof that people can feel the difference in their bodies and their moods. A pacemaker for th...

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