MRI images from a neurotypical control (left) and an adult with complete agenesis of the corpus callosum (right). The corpus callosum is indicated in red, fading as the fibers enter the hemispheres in order to suggest that they continue on. The anterior commissure is indicated by light aqua. The image illustrates the dramatic lack of inter hemispheric connections in callosal agenesis. Credit: Lynn Paul/Caltech (Medical Xpress)—Building on their prior work, a team of neuroscientists at Caltech now report that rare patients who are missing connections between the left and right sides of their brain—a condition known as agenesis of...