Functional magnetic resonance imaging (fMRI) measures brain activity by what means?
A) It compares the amount of radiation emitted by cells in various brain areas.
B) It compares the electrical activity to the magnetic activity within each brain area.
C) It compares the electrical activity of a brain area to the volume of the area.
D) It compares the amount of oxygen attached to hemoglobin in various brain areas.
Correct Answer:
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