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Electroencephalography is a non invasive method used to record electrical activity of the brain. It is done by placing electrodes on the scalp. It measures fluctuations from ionic current in the neurons providing results of brain function. It is used in diagnosing conditions like Brain tumors, Brain damage from a head injury, encephalopathy, dementia, encephalitis, migraine, hemorrhage, Inflammation of the brain, such as herpes encephalitis, Stroke, Sleep conditions, excessive alcohol or drug abuse, Creutzfeldt Jakob disease. Alzheimrs disease, Epilepsy, sleep disorders, absence seizures, cerebral hypoxia, cardiac arrest, brain death.

The recorded signals are analysed for different wave patterns like alpha , beta , theta , correspond to various mental states and activities. It is a gold standard procedure to confirm epilepsy. EEG is usually painless procedure. There are certain factors which interefere with reading of an EEG like low blood sugar , bright lights, some medications like sedatives, consuming caffeine, mouth and muscle movements , etc.