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functional Magnetic Resonance Imaging

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Functional magnetic resonance imaging or functional MRI (fMRI) is a functional neuroimaging procedure using MRI technology that measures brain activity by detecting associated changes in 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.

References:
  1. Wikipedia.http://en.wikipedia.org/wiki/Functional_magnetic_resonance_imaging
  2. Penny, William D, Friston, Karl J, Ashburner, John T, Kiebel, Stefan J, & Nichols, Thomas E. (2011). Statistical Parametric Mapping: The Analysis of Functional Brain Images: The Analysis of Functional Brain Images: Academic Press.