What does an EEG measure?

An EEG, or electroencephalogram, measures the electrical activity of the brain by detecting the electrical signals produced by the neurons. This technique allows for the assessment of both normal and abnormal brain function. It is especially useful in diagnosing conditions such as epilepsy, sleep disorders, and other neurological conditions, as it can reveal patterns of electrical activity that may indicate underlying issues.

The technology functions by placing electrodes on the scalp, which pick up the electrical impulses generated by the brain's activity. These signals are then recorded and analyzed, providing valuable insights into brain health and function. This is crucial for medical professionals when making diagnosis decisions and determining appropriate treatments.

Other options refer to bodily functions or structures that are unrelated to the purpose of an EEG, giving clarity on why they do not apply in this context.