CAN MAGNETS BUILD A BETTER BRAIN?

New tech aims to tweak what's in your head to help with depression, PTSD, and even everyday issues like sleep and focus. Should you plug in?

- ALLA KATSNELSON

PICTURE YOUR BRAIN as an intricate road map, networks of well-worn streets and highways laid out in every direction for wherever you want to go. Every time you book an Airbnb, figure out the tip on a bill, or laugh at a meme, nerve cells in your brain pass electrical messages along these networks of roads. When the signals move smoothly, they help you do all these things-get you excited about the trip, remind you to sign the receipt, stop you from laughing too loudly at the coffee shop, and so much more.