A brain imaging technique that measures over a few seconds the average neural activity in different brain regions by showing fluctuations in blood oxygen levels is known as a(n)____.

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fMRI (functional Magnetic Resonance Imaging) measures brain activity by detecting changes associated with blood flow. This technique relies on the fact that cerebral blood flow and neuronal activation are coupled. When an area of the brain is in use, blood flow to that region also increases, which can be detected and visualized through fMRI.

A Brain Imaging Technique That Measures Over a Few Seconds