With PET scans and functional MRI, we can observe fluctuations in brain activity by measuring changes in blood flow and levels of nutrients. (scientificamerican.com)
Changes in blood flow pattern, such as from plaque build - up in the arteries, initiate a cascade of conflicting signals. (sciencedaily.com)
Each participant underwent an fMRI scan, which measures brain activity by detecting changes in blood flow within the brain. (concussionwise.com)