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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.