Diffusion Tensor Imaging (DTI) is an MRI-based neuroimaging technique that enables the estimation of the location, orientation, and anisotropy of the brain’s white matter tracts.

Anisotropy = the property being directionally dependent (the contrary of isotropy). This implies different properties in different directions. (from Wikipedia)

The result is both mesmerising and colourful, as the following animation demonstrates:

Animation is from the Instagram account @neurosciencehub, www.instagram.com/neuroscience_hub