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| | EXplorations in Medicine |
 | | Berger named this new form of recording as the electroencephalogram (EEG, for short); * that this activity changed according to the functional status of the brain, such as in sleep, anesthesia, hypoxia (lack of oxygen) and in certain nervous diseases, such as in epilepsy. |
 | | Berger electrodes were too large to made detailed topographycal studies of the EEG (in other words, to use electrical activity recorded from the brain to pinpoint areas of sensory projection, the localization of tumors or of epileptic foci, etc.). |
 | | This was left to W. Gray Walter, a remarkable British scientist, who, in 1936, proved that, by using a larger number of electrodes pasted to the scalp, each one having a small size, it was possible to identify abnormal electrical activity in the brain areas around a tumor, and diminished activity inside it. |
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