via Wikipedia infobox
White matter structure of human brain (taken by MRI). Anterior on the right.
White matter refers to areas of the central nervous system that are mainly made up of myelinated axons, also called tracts. Long thought to be passive tissue, white matter affects learning and brain functions, modulating the distribution of action potentials, acting as a relay and coordinating communication between different brain regions.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).