The brains of unborn babies have now been imaged in action, showing how connections form.

This fMRI movie, produced by Moriah Thomason from Wayne State University in Detroit, Michigan, shows a fly-through of several fetuses in their third trimester. By comparing the scans at slightly different stages of development, Thomason was able to pinpoint when different parts of the brain wire up.

By identifying how brain connectivity normally develops, the scans could help diagnose and treat conditions like schizophrenia and autism before birth.

— New Scientist