Experts say Laureys' findings are likely to reopen the debate over when the decision should be made to terminate the lives of those in comas who appear to be unconscious but might have almost fully-functioning brains.
Belgian doctors used an internationally accepted scale to monitor Houben's state over the years. Known as the Glasgow Coma Scale, it requires assessment of the eyes, verbal and motor responses. But they failed to assess him correctly and missed signs that his brain was still functioning.
Laureys, who is head of the coma science group and neurology department at Liège University hospital, concluded coma patients are diagnosed falsely "on a disturbingly regular basis". In around 40% of cases diagnosed as vegetative, more careful examination shows there is still some level of consciousness. He examined 44 patients believed to be in a vegetative state, and found that 18 of them responded to communication.[emphases mine]
