Split-brain patients are a common product of Grand Mal epilepsy. Severing the communication between right and left hemispheres, tends to be effective in eliminating the electrical storms inside of an epileptic person’s brain. There are all sorts of cool things we can learn from split-brain patients.
For instance, the right hemisphere does not have the ability to “talk”, but it controls the left side of the body. A split brain person may find themselves untying their shoes, drawing uncontrollably, hitting someone, etc. The left hemisphere is solely responsible for speech, though both sides can process language. Because it is so ingrained in language it feels compelled to create stories to explain unconscious behavior. It is perhaps the location of self-identity as is linguistically encoded.