What is measured by an EEG?

Electroencephalography (EEG) is a procedure that measures the electrical activity of the brain. EEG records the changes in voltage that occur on the scalp as a result of the brain's ongoing electrical activity. These changes in voltage are generated by the action of the brain's neurons, which communicate with each other by sending electrical signals. The EEG records the overall electrical activity of the brain and can provide information about the brain's state, including its level of consciousness, the presence of seizures, and the location of functional abnormalities. EEG is a valuable tool for diagnosing neurological conditions and monitoring brain function.