Thanks to a mouse watching clips from “The Matrix,” scientists have created the largest functional map of a brain to date.

In 1979, biologist Francis Crick claimed it would be impossible to create an accurate diagram of the brain’s wiring and neuronal activity—even within just a cubic millimeter of brain tissue.

Get Instant Summarized Text (Gist) A comprehensive wiring diagram and functional map of a mouse brain's visual cortex, the largest to date, has been created from a cubic millimeter of tissue. This ...

Scientists Wednesday unveiled a functional 3-D map of the 84,000 neurons in a cubic millimeter of a mouse's brain, along with more than three miles of microscopic wiring — axons and smaller ...