Split-brain patients have had surgery to cut the

Split-brain patients have had surgery to cut the  corpus callosum. Such a phenomenon was studied and monitored by  two neuroscientists Roger Sperry  and Michael Gazzaniga. After hard operation, patients felt quite good although the expectations weren't that good. Patients could perform all the activities they did before surgery, that was very surprising and innovational. But after several experiments, doctors discovered side effects and got back  to study this process.