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It was unknown, however, whether this change takes place at the level of individual nerve fibers or if adaptive myelination is also transferred to neighboring, passive axons in a fiber bundle.

Now, researchers have published the most detailed examination to date of the tiny, muscle fiber bundles involved.

These fiber bundles are white because the axons are coated with a fatty substance called myelin, which acts as electrical insulation and boosts the speed of transmission by 50 to 100 times.

In physics, a gauge theory is a kind of field theory, formulated in the language of the geometry of fiber bundles; the simplest example is electromagnetism.

At issue is the anatomy of the brain's largest fiber bundle structure, the corpus callosum, which connects the brain's two hemispheres.