Saturday, September 16, 2006

Controlling artificial arm via the brain

Do you know that all the movements of the body are stirred by the subconscious mind? How else is it possible that you can move your hands, or get into a car or go around somehow?

Do you tell you body to move? Muscle number one, please contract, number 2 expand, number 3 do this .... and so on? Nope - it is all stirred from parts in your brain, automatically and since we are born or even earlier.

But here comes the exciting news. How about the news that someone is able to move an artificial arm via thoughts?

26-year-old Claudia Mitchell is just doing this. She lost her arm in a motorcycle accident and recently received an artificial limp, or, better, a bionic arm.
The medical team "found a way to use chest muscles to connect the prosthetic to nerves that once sent signals to the hand, wrist, elbow and shoulder. After an amputation, the brain still thinks the arm is there. It feels sensations and sends signals to move. But those signals are too weak for modern mechanics to detect from the surface of the skin, so Kuiken's team amplified them."

"First, plastic surgeon Greg Dumanian of Northwestern Memorial Hospital moved the targeted nerves into muscles in Mitchell's chest. Then, the nerves that cause the motion of those muscles were disconnected. Mitchell can no longer send a signal to flex her pectoral muscle, but when she wants to close her hand or bend her elbow, the nerve impulse moves her "pec.
When that muscle moves, it sends a signal strong enough for a sensor on the skin to detect. After some rewiring by Dumanian, six muscles in Mitchell's chest now move six motors in the bionic arm.

And nerve data flow up, too. When Todd Kuiken, who heads neural engineering, touches a certain spot on Mitchell's chest, she feels him touch her hand, even though it's no longer there."
There is more work that needs to be done but this is only the beginning of exciting times for those that struggle with losses of limps.

(NLP in Asia)

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