Which procedure would be used to examine electrical activity in the brain?

The procedure used to examine electrical activity in the brain is an electroencephalogram (EEG). An EEG involves placing electrodes on the scalp to detect and record the electrical impulses generated by the brain's neurons. This technique is particularly useful for diagnosing conditions such as epilepsy, sleep disorders, and other neurological conditions, as it provides real-time data on brain activity.

In contrast, other imaging techniques serve different purposes. For instance, magnetic resonance imaging (MRI) provides detailed images of brain structures but does not capture electrical activity. Likewise, computed tomography (CT) scans use X-ray technology to create cross-sectional images of the body, focusing on structural rather than functional aspects. X-ray imaging primarily offers images of bones and certain tissues, not the dynamic electrical functions of the brain. Thus, the EEG stands out as the appropriate tool for directly assessing the brain's electrical activity.