AP Psychology Practice Test

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Study for the AP Psychology Exam with a comprehensive quiz that includes flashcards and multiple choice questions. Each question is accompanied by hints and explanations to enhance understanding. Prepare effectively for your exam!

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What is an EEG used to measure?

Bone density
Brain's electrical activity
Blood flow
Muscle activity

The correct answer is: Brain's electrical activity

An EEG, or electroencephalogram, is specifically used to measure the electrical activity of the brain. This technique involves placing electrodes on the scalp that detect and record electrical impulses generated by neurons communicating with one another. It provides real-time insights into brain function, helping to identify patterns associated with various mental states, sleep stages, and neurological conditions. The EEG is particularly valuable in diagnosing conditions such as epilepsy, sleep disorders, and other brain-related issues, as it captures the brain's dynamic processing in a non-invasive manner. The other options relate to different physiological measurements: bone density is assessed through techniques like dual-energy X-ray absorptiometry (DEXA), blood flow is typically measured using imaging techniques such as fMRI or PET scans, and muscle activity can be monitored through electromyography (EMG). Understanding these distinctions emphasizes the unique role of the EEG in the study of brain function.