A video shows an incredible bionic arm moving'like a human hand' controlled by the patient's thoughts. The modern prosthetic, designed by engineers, gives hope to amputees who have to rely on plastic moulds with barely any dexterity. Scientists created a so-called'nerve interface' which picks up tiny electrical signals coming from the remaining nerves of an amputee's upper arm. It has allowed patients to use just their thoughts to precisely move the fingers and thumbs of their artificial hand, even enabling them to play rock, paper, scissors. The Mobius Bionics LUKE arm, developed by a medical device company in the US, has been tested on four patients. Amputee Joe Hamilton said using the prosthetic is like'having a hand again' after he was able to place tiny building blocks on top of each other.