fMRI signals in the brain’s visual cortex as an individual views the checkerboard stimulus. The green, blue and dark blue spots represent signals produced within a fraction of a second after stimulation with dark blue being the fastest responding areas. Source: Lewis, et al.2
By significantly increasing the speed of fMRI, researchers have been able to image rapidly fluctuating brain activity during human thought. fMRI measures changes in blood oxygenation, which were previously thought to be too slow to detect the subtle neuronal activity associated with higher order brain functions...
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