3d rendering of human brain on technology background represent artificial intelligence and cyber space concept

A man in a permanent vegetative state (PVS) for the past 15 years has shown signs of consciousness after pioneering nerve stimulation treatment. 
The 35-year-old was left apparently unaware of the world around him following a car accident in 2001, but is now responding to questions a month after having a stimulator placed on a nerve which connects the heart, lungs and digestive tract to the brain.
The treatment is challenging the commonly accepted view that there is little prospect of a recovery if a patient has been in PVS for more than a year. 
As well as responding to simple requests such as turning his head, the patient could track objects with his eyes and stay awake while being read a story. 
He even attempted to smile when asked and had tears in his eyes when played music by his favourite French singer Jean-Jaques Goldman, reports the New Scientist.
Angela Sirigu, who led the work at …