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A woman who is paralysed from the neck down has stunned doctors with her extraordinary skill at using a robotic arm that is controlled by her thoughts alone.
The 52-year-old patient, called Jan, lost the use of her limbs more than 10 years ago to a degenerative disease that damaged her spinal cord. The disruption to her nervous system was the equivalent to having a broken neck.
But in training sessions at the University of Pittsburgh, doctors found she quickly learned to make fluid movements with the brain-controlled robotic arm, reaching levels of performance never seen before.
"We were blown away by how fast she was able to acquire her skill, that was completely unexpected," said Andrew Schwartz, professor of neurobiology at the University of Pittsburgh.
"At the end of a good day, when she was making these beautiful movements, she was ecstatic."