A functional MRI measures the change in blood oxygen level in the brain. As different areas of the brain become more active, they require more oxygen, which leads to an increase in blood flow to that area. This change in blood oxygen level can be detected using an MRI machine, allowing researchers to map brain activity.

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A Functional MRI

Question 213

Multiple Choice

A functional MRI

A) measures tiny magnetic fields.
B) shows promise as a treatment for depression.
C) measures the change in blood oxygen level.
D) applies magnetic fields to the brain.

Correct Answer: