Three of the following describe methods that researchers commonly use to determine how the human brain probably functions. Which one is not a commonly used method to study the brain?
A) Documenting the behaviors of people with various kinds of brain injuries
B) Recording brain activity through PET scans, CAT scans, and similar technologies
C) Measuring the levels of various hormones and other substances in the blood
D) Removing a certain part of an animal's brain and observing the animal's subsequent behaviors

Question

Quizplus · Accepted Answer

Measuring the levels of various hormones and other substances in the blood is not a commonly used method to study the brain. While hormones and other chemicals can affect brain function, measuring their levels in the blood does not provide direct insight into how the brain is functioning. The other three methods listed all involve direct observation or recording of brain activity or behavior.

Three of the Following Describe Methods That Researchers Commonly Use