Final answer:
Severing the corpus callosum can cause a condition called split-brain, resulting in symptoms such as the inability to verbally name objects seen in the left visual field, even though patients can select the correct object with their left hand.
Step-by-step explanation:
The question addresses the consequences of severing the corpus callosum, which is a significant surgical procedure performed to control severe epilepsy. When this structure linking the brain's left and right hemispheres is cut, a condition known as split-brain results. This condition reveals unique insights into the functioning of each hemisphere. Split-brain patients experience a variety of symptoms. One notable symptom is the inability to name objects presented to the left visual field because the right hemisphere, which receives this visual input, cannot communicate with the speech centers typically located in the left hemisphere. Fascinatingly, these same patients might still be able to select the correct object with their left hand, which is controlled by the right hemisphere, yet remain unable to verbally identify it.