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The grey matter of the brain is responsible for information processing, and it covers the brain like a folded sheet. The thickness of this sheet varies across the brain, and is colour-coded here, from red (thickest, at 5mm) to blue (thinnest, 0.5mm). Grey matter is made up of nerve cell bodies, and is thickest in the frontal lobes of the brain, at the top. The frontal lobes are thought to control languages, memory, judgment and social skills, amongst other things.
Image generated by a computer algorithm, written by the photographer, that calculates thickness over the brain from MRI scans
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