Just as most roads in the United States are local streets rather than interstate highways, most connections in the brain are short range. In this interactive tool, fibers are removed based on their length. As the cursor moves right, progressively longer fibers are subtracted from the visualization.
The red and orange fibers in the lower left quadrant of the image, which begin to disappear when the cursor is at its midpoint, are part of the brain’s sensory association pathways, integrating visual auditory information, for example. The last fibers to remain–the blue C-shaped fibers running horizontally across the middle of the image–are part of the cingulum bundle, which runs from the prefrontal cortex, which is involved in planning and higher cognitive function, to the parietal cortex, which is mainly involved in synthesizing sensory information.