This clip is from a longer video in the article with Ariel Garten, the co-founder of Muse: the brain sensing headband, talking about how the system works.
Here is part of a review - from article "Can Meditation Gadgets Help You Reduce Your Stress—and Find Happiness?" by Michael Hsu, Wall Street Journal.
"As a technology editor, I predictably looked to the least-meditative, most distracting thing in my life for a solution: my smartphone—specifically apps that pair with electroencephalography (EEG) headsets to provide biofeedback for meditators.
"The headsets pick up electrical activity emitted by the brain, and the apps interpret the data to provide visual or audio cues to let you know when it thinks you’ve attained a meditative state.
"These are like fitness trackers for the mind: motivating tools that promise to take a lot of the guesswork out of meditation. ...
"The product that offers the most pleasant experience overall is the Muse, a sleek headband that rests across your forehead and over your ears.
"The Muse’s polished companion app uses audio feedback to facilitate the meditation process..."