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Brain-wave scanners could one day make it possible for us to communicate with some brain-dead patients. Recent studies have shown that some vegetative patients might be more aware than they seem. Now, Damian Cruse, with the Medical Research Council’s Cognition and Brain Sciences Unit in Cambridge, UK, thinks EEG machines will be able to help these patients communicate.

The team asked six healthy volunteers to wear electroencephalography (EEG) devices, which connect electrodes to a person’s head. They were asked to respond to an audible tone by imagining that they were squeezing their right hands or wiggling the toes of both feet. The researchers found that the volunteers’ brain responses were clearly different — the hand-squeezing activated the left-hand side of the brain and the toe-wiggling produced a response in the center of the brain.

They then tested the procedure on a patient with locked-in syndrome, who was almost completely paralyzed but retains some control of his eye movements. His brain responses were the same. Finally, they tested the procedure on a patient who had been declared vegetative two years earlier. They watched the EEG signals and were able to deduce which movement the patient was imagining.

The same team had studied 23 vegetative patients over four years and found four patients were able to consistently respond to yes or no questions by changing their brain activity. They were asked to imagine playing tennis when they wanted to give one response, or walking around the house when they wanted to give the other.

Since the patients were responsive, they are not technically vegetative, the researchers say. Proof that they can communicate — that they’re not brain-dead — would have major implications for family members’ and doctors’ decisions about their care.

Source: Popular Science.


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