Researchers have created the largest and most detailed wiring diagram of a mammalian brain to date, by mapping cells in a cubic millimetre of a mouse’s brain tissue 1. In a landmark achievement, the diagram also details the activity of individual neurons on a large scale ― a neuroscience first.

They managed to do something that we haven’t done as a neuroscience community in basically all of our history, which is to be able to map the activity of neurons onto the wiring on a very large population of neurons,