SSS 2009-05-08（在线收听）

This is Scientific American’s 60-second Science. I’m Karen Hopkin, this will just take a minute.

For every action there is a reaction, and for many movements we make, there is an intention. We think about moving, and we move. Now a study published in the May 8th issue of the journal Science suggests that the experience of moving is all in your mind. Because the part of the brain that's active when you intend to move is the same part that let you feel like you did. Two separate brain regions are involved in moving you body. One part provides the intention, and the other powers the actual movement.

But researchers didn’t know which part let you know that you actual moved. In the new study, Scientists were working with patients undergoing surgery to remove a brain tumor. Surgeons often electrically stimulate the area around the tumor while the patient is awake and can provide feedback. So they can avoid damaging critical tissue. The scientists found that zapping one particular part of the brain made their patients feel like they wanted to move their arms, lips or tongue. And ramping up the stimulation to that spot made them feel they've done it .But when the team poked at the region that actually caused motion, the patients didn’t know their moved-----a finding that is oddly moving.

Thanks for the minute. For scientific American’s 60-second Science. I’m Karen Hopkin.