#eeg

#eeg

The team wanted to find out whether the disconnected part has some form of awareness - or was capable of exhibiting consciousness, says co-author Marcello Massimini, a neurophysiology researcher at the University of Milan in Italy. "The question arises because we have no access" to the disconnected region, he says, adding that it was unclear what happens once part of the brain is isolated.

The brain generates rhythms naturally. One way to confirm this is to record the brain's electrical activity. This electrical activity results from the passage of ions (particles with positive or negative charge, such as sodium and chloride, the components of salt) across brain cell membranes. EEG (electroencephalography), a painless and harmless technique using wires (electrodes) placed on the scalp to record this activity, has been around for nearly a century. EEG reveals that much of a healthy brain's electrical activity is rhythmic, not random.

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