Ten years ago, a Fitbit was about as sophisticated a wearable as you could get. The Apple Watch soon supplanted it, quickly becoming the world’s best-selling smartwatch. Then came the sleeker, more unassuming Oura ring.
Now there’s a new breed of wearables—built for your head. Instead of tracking your step count, heart rate, and skin temperature, these devices are designed to read your brain waves. Using electroencephalography, or EEG, they detect electrical impulses produced by the brain and use AI…
