What happens during an electroencephalogram (EEG)?
Many organs produce electrical signals that can be detected and measured using various techniques. One well-known example is the electrocardiogram (ECG or EKG), which is used to see the electrical currents in the heart. The nerve cells in the brain also produce characteristic electrical currents. Like in an ECG, these currents can be picked up using electrodes on the body’s surface. This kind of measurement is called an electroencephalogram (EEG). In an EEG, the electrodes are placed on specific points on your head and connected to an EEG machine with cables. The electrodes measure the activity of the brain and display it as a graph on a screen.