In which of the following ways does functional magnetic resonance imaging (fMRI)detect the functioning of the brain?
A)It exploits changes in blood oxygen that occur in association with brain activity.
B)It measures the amount of glucose in various areas of the brain.
C)It studies the brain only when the brain is active.
D)It establishes a cause-effect relationship between variables associated with brain activity.

Question

Quizplus · Accepted Answer

fMRI detects the functioning of the brain by exploiting changes in blood oxygen that occur in association with brain activity. When a specific region of the brain is activated, it requires more oxygen, and the blood flow to that region increases to supply the required oxygen. By measuring the changes in the concentration of oxyhemoglobin in the blood, fMRI can identify the location and intensity of brain activity. Choices B, C, and D are incorrect because fMRI does not measure glucose, studies the brain when it is both active and at rest, and does not establish a cause-effect relationship.

In Which of the Following Ways Does Functional Magnetic Resonance