Which device is used to measure electrical brain activity?

The device used to measure electrical brain activity is an electroencephalogram, commonly referred to as EEG. This method involves placing electrodes on the scalp to detect and record the electrical impulses that neurons in the brain generate during their activity. EEG is particularly effective in capturing brain waves and identifying patterns related to different states of consciousness, such as sleeping, waking, or experiencing seizures.

Other imaging techniques, while they provide important information about brain structure and metabolic activity, do not measure electrical activity directly. For instance, MRI (Magnetic Resonance Imaging) offers detailed images of brain anatomy through magnetic fields and radio waves but does not capture dynamic electrical activity. Similarly, CT (Computed Tomography) scans use X-rays to create a series of cross-sectional images of the brain, and PET (Positron Emission Tomography) scans illustrate metabolic processes by measuring the emission of positrons, but neither focuses on the electrical signals that result from neural activity. This crucial distinction highlights why EEG is the correct choice for measuring electrical brain activity.