Which term describes the procedure recording brain electrical activity to detect seizures, tumors, or injuries to the brain?

Which term describes the procedure recording brain electrical activity to detect seizures, tumors, or injuries to the brain?

• A. Lumbar puncture
• B. Sinus cavities
• C. Electroencephalogram (EEG)
• D. Refractive errors

Answer: (C)

Recording brain electrical activity to detect seizures, tumors, or injuries is done with an electroencephalogram. An EEG uses electrodes placed on the scalp to pick up the electrical signals that brain cells generate. Those signals help doctors see patterns of activity: seizures often produce distinctive spike-and-wave discharges, while tumors or injuries can cause slowing or localized abnormalities in the EEG readings. This test is noninvasive and widely used to diagnose epilepsy, monitor brain function, and guide treatment or surgical planning.

The other options don’t fit: a lumbar puncture collects cerebrospinal fluid from the spine, not brain electrical activity; sinus cavities are air-filled spaces in the skull and not a brain-monitoring procedure; refractive errors pertain to vision and involve the eye, not brain activity.