Dear Freesurfers
Hi I was trying to look at the activation in different cortical layers in a single subject. I ran my preproc-sess command three times, once without using -projfrac flag, once -projfrac 0.5 and lastly -projfrac 0.2 The activation patterns are exactly the same. My voxel sizes are 1.1*1.1*1.1 . My question is: 1-Is it normal that the activations do not change at all the more I get closer to white matter? 2-when I use -projfrac 0.2 , does it mean that I am averaging the activation between white matter layer to 0.2 of gray matter layer? Or is it averaging the activation between pial surface to 0.2 gray matter? I hope my questions are clear. Thanks Mona
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