Furthermore, it may be indicative of cerebral dysfunction by demonstrating focal or generalized slowing. While a normal EEG does not exclude a clinical diagnosis of epilepsy, an abnormal finding on EEG may be supportive of the clinical diagnosis. For the successful interpretation of an abnormal EEG, one must first understand the criteria necessary to define normal patterns. Information about a diffuse or focal cerebral dysfunction, the presence of interictal epileptiform discharges ( IEDs), or patterns of special significance may be revealed. Intracranial EEG provides focused EEG recording directly from the brain from surgically implanted electrodes that are targeted at specific regions of the brain. ![]() Extracranial EEG provides a broad survey of the electrocerebral activity throughout both hemispheres of the brain. EEG involves the study of recording these electrical signals that are generated by the brain. It is a graphic display of a difference in voltages from two sites of brain function recorded over time. The EEG is a unique and valuable measure of the brain’s electrical function.
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