Three years ago new high-tech scans revealed that his brain was functioning normally.
His case has only just been revealed in a scientific paper released by the man who ‘saved’ him, top neurological expert Dr Steven Laureys.
‘Medical advances caught up with him,’ said Dr Laureys, who believes there may be many similar cases of false comas around the world.
Dr Laureys’s new study claims that patients classed as in a vegetative state are often misdiagnosed.
‘Anyone who bears the stamp of “unconscious” just one time hardly ever gets rid of it again,’ he said.
The doctor, who leads the Coma Science Group and Department of Neurology at Liege University Hospital, found Mr Houben’s brain was still working by using state-of-the-art imaging.