Description of Roger with severe hydrocephalus by Dr. John Lorber
The Minds of many people missing half their brain after surgery function normally, indicating that the Mind must be functioning outside of the brain. The procedure, called a hemispherectomy, removes half of the brain from the patient’s head. The operation is performed for disorders that can’t be controlled using any other treatments. A study of hemispherectomies in 2015 found that between 2000 and 2009, there were 552 hospital admissions for hemispherectomy surgery. After half of the brain has been removed, the patients retain their personalities and memories. In fact, a study of children who had half of their brains removed found they often were able to perform even better in their school work.
One student at the University of Sheffield had an IQ of 126, gained a first-class honors degree in mathematics, and was socially completely normal. “And yet the boy has virtually no brain,” Dr. Lorber said.
When we did a brain scan on him, . . . we saw that instead of the normal 4.5-centimeter thickness of brain tissue between the ventricles and the cortical surface, there was just a thin layer of mantle measuring a millimeter or so. His cranium is filled mainly with cerebrospinal fluid.
A video describing the student’s brain scans follows.