READ MORE: 'Several killed' in Copenhagen shooting by gunman with 'automatic' weapon The man moves his arms slightly to bring the cake to him as the computer says: “Moving food to mouth.” A brain-machine interface creates a direct link to the robotic arms. The study was carried out at Johns Hopkins medical centre in Maryland, US.The feat is part of an experiment by American researchers who hope to assist people with disabilities by developing robots that can be operated with brain signals and require limited physical movement.