What Does fMRI Measure?

University:
Massachusetts Institute of Technology
Course:
9.03 | Neural Basis of Learning and Memory
Academic year:

2022
Views:

47

Pages:

1
Author:

texans105bvn

WHAT DOES fMRI MEASURE? • Whenever neurons in a particular brain area are firing, blood flow to that area increases (Roy & Sherrington, 1890). • The increased blood flow brings more oxyhemoglobin to that area. • The inflow of oxyhemoglobin increases more than the increase in oxygen consumption. Thus, the concentration of deoxyhemoglobin decreases in the veins. • Because deoxyhemoglobin is magnetic and not uniformly distributed (it’s in red cells), the decrease in deoxyhemoglobin makes the magnetic field more homogeneous. • When the magnetic field becomes more homogeneous, the MR signal increases in intensity.

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