Split Brain Syndrome has been performed on humans since the late 1930s. The procedure for split brain syndrome involves cutting the corpus callosum, a thick band of nerve fibers that divides the brain into two different hemispheres, the left and the right. The corpus callosum connects the left and right sides of the brain allowing communication between the two hemispheres. The reason why the brain division procedure is performed is to prevent the spread of epileptic seizures from one hemisphere to the other. When the brain is severed, both cerebral hemispheres stop communicating with each other. Many people are starting to wonder if this also divides consciousness. The split-brain procedure has many disunity that can cause some difficulties in reading, writing, etc. on a daily basis. So I would say that split-brain patients do not have a totally unified consciousness. The original procedure that resembles the split-brain procedure is called commissurotary. The commissurocy involves disruption of many interhemispheric tracts that include the anterior commissurotomy, the intermediate mass of the thalamus, and the hippocampal commissure, as well as the corpus callosum. Later, with further research, the other unnecessary cut was eliminated. The brain division procedure we know today is called callosotomy. Through my research I have noticed that both callosotomy and commissural patients are both split brain patients, so many do not know this difference when expressed in this way. After fully understanding the split-brain procedure, many begin to wonder how much disunity or inconvenience happens to these patients. Split-brain data collected over time shows that the pa... middle of paper... logically and scientifically. Even today, many raise the question of the unity of consciousness. As Elizabeth Schechter stated in her work: “This work is about identifying mental tokens from a theoretical or scientific perspective and the insights that split-brain studies yield into such individualization. It focuses on two questions about mental tokens particularly in split-brain subjects: how many minds they have and how many streams of consciousness they have. “After presenting this topic and analyzing various experiments such as the keychain experiment and the dimensional change paper sorting task, then further understanding the partial unit model and the two-stream model, we can understand why split-brain patients have a disunified consciousness In conclusion, split-brain patients do not have a completely unified consciousness.