Split-brain surgery is a medical procedure that involves cutting the corpus callosum, the bundle of nerves connecting the two hemispheres of the brain. This surgery is primarily performed to treat severe cases of epilepsy that do not respond to medication. By severing this connection, doctors aim to prevent seizures from spreading between the two sides of the brain. After the surgery, patients may experience changes in how their brain processes information. For example, they might have difficulty coordinating actions between the two sides of their body or face challenges in verbalizing what they see with one eye.