What is the term for a recording of brain waves?

The term for a recording of brain waves is electroencephalography (EEG). This technique involves placing electrodes on the scalp to detect and measure electrical activity in the brain. The resulting trace, known as an electroencephalogram, provides valuable insights into brain function and can help diagnose various neurological conditions, including epilepsy, sleep disorders, and brain injuries.

In contrast, an electrocardiogram (ECG) is a test that measures the electrical activity of the heart, not the brain. Magnetic resonance imaging (MRI) and computed tomography (CT) are imaging techniques used to visualize structures within the body, including the brain, but they do not record brain waves. MRI uses magnetic fields and radio waves to create detailed images, while CT uses X-rays to produce cross-sectional images. Therefore, the correct response—electroencephalography (EEG)—specifically pertains to the measurement of brain electrical activity.