The nerve fibers that enable communication between the right and left cerebral hemispheres and that have been severed in split-brain patients form a structure called the

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The corpus callosum is a thick band of nerve fibers that connects the two hemispheres of the brain and enables communication between them. It is the structure that is severed in split-brain patients, resulting in a lack of communication between the right and left hemispheres.

The Nerve Fibers That Enable Communication Between the Right and Left