It's called Mindwalker - the world's first robotic exoskeleton, designed to operate with the power of thought. It's a futuristic concept being developed by a pan-European team of scientists. They say the device could eventually offer paralysed and locked-in people a viable alternative to the wheelchair. The first prototype was designed to hold a person's body upright and move their legs when instructed by a computer. But the researchers want to take the technology a big step further.