Paralysed patients control robotic arm with thoughts
16 May 2012 Last updated at 18:59 BST
Two patients in the United States, who are paralysed from the neck down, have been able to control a robotic arm using their thoughts.
It allowed Cathy Hutchinson to drink unaided for the first time in nearly 15 years.
The technique, described in the journal Nature, links a sensor implanted in the brain to a computer, which translates electrical signals into commands.
Fergus Walsh reports.