Cortical thickness varies in the hills (gyri) and valleys (sulci) of the convoluted primate brain. Gyral cortex visible at the surface of the brain (top) is comparatively thicker (shown in red) than cortex hidden in the convolutions. Thinner cortical regions (shown in green) only become apparent once the convolutions are unfolded (bottom) (see Hilgetag and Barbas).
Image Credit: Maps were reconstructed and cortical thickness measured using the Freesurfer software (Fischl and Dale 2000), as described in the text. Additional image manipulation completed in Adobe Photoshop.
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