In fact, in the near future, Ryan D’Arcy told me, all doctors should be monitoring brain waves, alongside more standard clinical vital signs of patients, healthy and otherwise, via electroencephalogram, or EEG, which monitors electrical activity of the brain. D’Arcy made this case in a recent article in the journal Frontiers in Neuroscience.
The work still has a long way to go. For now, it’s more about establishing baselines of what a “healthy brain” might look like. And EEG, which is used to diagnose disorders like narcolepsy, Alzheimer’s, and certain brain disorders, is an imperfect tool. Because it relies on electrodes placed on the scalp, it can’t get a very detailed picture of what’s happening in every part of the brain, and the signals can be distorted by noise.

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