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The most widely used brain-imaging technology in neurology and neuroscience research. EEG is the recording of the brain's electrical activity through electrodes attached to the scalp. In clinical use, the EEG is thought to provide gross anatomical correlates of brain activity and is the primary tool for the diagnosis of epilepsy. EEG technology is also used to record event-related potentials, which are elec trical activity in the brain that follows the presentation of an external sensory stimulus.

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