In diagnostic testing, the electroencephalogram measures activity in which cells?

• A. Examine the Impulses of the Nerve Cells Within the Brain.
• B. Measure the Amount of Air Upon Exhalation.
• C. Examine the Impulses of the Specialized Muscle Cells of the Heart.
• D. Measure the Pressure Within the Eye.

Answer: (A)

Electroencephalography records electrical activity produced by neurons in the brain, typically with electrodes on the scalp. This directly reflects the impulses of brain nerve cells, which is exactly what the EEG monitors. Other tests measure different things: exhaled air relates to breathing, heart muscle impulses are tracked by an ECG, and eye pressure pertains to eye health. So the EEG specifically measures activity of brain nerve cells.