fMRI, or “functional magnetic resonance imaging”, is a neuroscientific tool used to measure indicated brain activity. Like MRI, fMRI measures blood flow, and thus when looking at the brain with fMRI one is actually seeing the associated activity which accompanies blood flow (this assumption of association between blood flow and activity is long held, but still debatable in the field). To indicate varying levels of activity, this imaging technique assigns colors to identify areas most active to least active. Typically, the color scale used ranges from light yellow (most active), to light blue (least active), with dark yellow, red, and dark blue lying between, in descending order of activity level.
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