Kim says the researchers found some nerve bundles grew longer and other bundles became shorter, or contracted, after the players' initial MRI scans at the beginning of the season. He says they saw no changes in the integrity of the bundles.
The team says these results suggest that repeated blows to the head could lead to changes in the shape of the corpus callosum, which is critical to integrating cognitive, motor and sensory functions between the two hemispheres of the brain, during a critical time for brain development in young people.
