A group of European scientists said Wednesday they have successfully connected a robotic hand to an amputee, allowing him to feel sensations in the artificial limb and control it with his thoughts. The experiment lasted a month, and scientists say it was the first time a patient has been able to make complex movements using his mind to control a biomechanical hand connected to his nervous system. The Italian-led team said at a news conference Wednesday in Rome that last year it implanted electrodes into the arm of the patient who had lost his left hand and forearm in a car accident.