Brain blood flow responds differently to pain and touch, mouse study finds
When the brain is stimulated, blood flow increases. For 30 years, functional magnetic resonance imaging (fMRI), one of the most powerful windows into the human brain, has operated on the basis of this connection. fMRI doesn't actually see neurons firing; it tracks changes in blood oxygenation.
<p>When the brain is stimulated, blood flow increases. For 30 years, functional magnetic resonance imaging (fMRI), one of the most powerful windows into the human brain, has operated on the basis of this connection. fMRI doesn't actually see neurons firing; it tracks changes in blood oxygenation.</p>