San Francisco, California, January 7, 2011 - University of California San Francisco Medical Center Neurologist and Co-Director for the Center for Neural Engineering at UC Berkeley and San Francisco, Dr. Edward Chang looks at a projection of the brain of Savanna Kelley during her Corpus callosotomy, an operation to sever the Corpus callosum, a broad band of nerve fiber joining the left and right side of the brain. .When Ms. Kelley was three she developed leukemia. With her father serving time in Iraq during the first Gulf War, her mother made the decision to try an experimental chemotherapy. Her mother, Marisa Martin says this treatment stunted Ms. Kelley's mental growth. A few years later Ms. Kelley began to have seizures. These seizures have intensified more recently starting in one hemisphere and rapidly spread to the other, multiplying the effect. Such patients often fall suddenly when a seizure strikes and hurt themselves. This surgery doesn't prevent seizures, but it reduces their severity by confining them to one hemisphere and makes falls less likely..