This correspondence between brain state and brain responsiveness (statedependent responses) is outlined at different scales from the cellular and circuit level, to the mesoscale and macroscale level.

It’s 3 a.m. in Nairobi, and Ken’s laptop and phone glow in the dark. On one screen, waves crash against a beach in a video, and on the other, a woman stretches into a yoga pose. He has watched each ...