From Stuart Butler
In his article on the nature of self, Julian Baggini says that “in the 1960s Roger Sperry and Michael Gazzaniga famously severed the corpus callosum in several people with epilepsy” (12 March, p 34). In fact Philip Vogel and Joseph Bogen were the neurosurgeons who carried out what became known as the “split brain” operation to treat epilepsy in this group of patients. Sperry and Gazzaniga subsequently studied the patients’ cognitive function.
Portishead, Somerset, UK
