Electroencephalography (EEG)

Electroencephalography (EEG) are noninvasive tests that measure electrical activity in the brain to evaluate brain disorders. Electrodes attached to the scalp record brain-cell electrical impulses — seen as wavy lines. Epilepsy seizure activity appears as rapid spiking waves. Brain tumors/stroke show slow EEG waves. EEGs can diagnose disorders that influence brain activity (Alzheimer’s disease, psychoses, sleep disorders); help evaluate trauma, drug intoxication, or neurological brain conditions, like autism; and study cognitive aspects of language.