Several years ago, a company called Neurosky came out with an interesting chipset meant to be put in an EEG headset ... based on the Delta, Gamma, Alpha, and Beta waves in your brain.

While they were listening, the researchers collected recordings using electroencephalography (EEG), a technique that ... may be encoded in the delta- (1–4 Hz) and beta-band (12–30 Hz ...

Recently, neuroscientists recorded for the first time the brain activity of a person just before and after cardiac arrest, providing insights into what someone may experience in their final moments.