"Observers criticized the science-by-press conference and said Canavero still has offered no evidence that the biggest hurdle — reconnecting the severed spinal cords from two different people and restoring brain motor function — has been overcome. “To be able to say you can just stick someone else’s head on someone else’s body is not really feasible based on current medical understanding. I’d be very keen to hear his explanation about how we’ve got around these issues,” said Dean Burnett, a neuroscientist and psychiatry lecturer at the Centre for Medical Education at Cardiff University.