 |
 |
Hi, in order to understand our results I looked into the AAL output more deeply. On the first glimps it looks really simple but there seems to be a factor somehow in the numbers. And I cannot make sense out of it. Here ist a small example Label % Cluster Nb Vx Cluster % Label Nb Vx Label ----------------------------------------------------------------------------------------- ParaHippocampal_R 71.83 71 1.90 1132 Fusiform_R 25.35 71 0.30 2518 Hipocampus_R 1.41 71 0.04 946 OUTSIDE 1.41 71 0.00 0 When I look at the first row, I can see that 71.83% of my current cluster belongs to the ParaHipp_R. Since the cluster consists of 71 voxel that would be about 51 voxel for this label. These 51 voxel are 1.9% of the ParaHipp_R, which would mean that the ParaHipp_R consists of 51/0.019 = 2684 voxels. And this is in contradiction to the 1132 voxels in the table. Ratio: 2684/1132=2.37 When I do the same calculations for row 2 and 3 I always get this ratio. In a next step I looked into the code of the m-file: gin_clusters_plabels.m and found this code (line 368-374): voiCluster = M(1,1)*M(2,2)*M(3,3); voiROI = MNID.mat(1,1)*MNID.mat(2,2)*MNID.mat(3,3); if voiCluster ~= voiROI fact = abs(voiROI/voiCluster); else fact = 1; end A test run were I printed out the value of the factor revealed that this is indeed the ratio I found in the output. My questions are now what this factor stands for and how I can interprete the results. Thank you for taking the time to look at this. Best regards, Katharina