Dear all,

I am conducting an analysis using the lGI to quantify cortical folding. As advised in the tutorial I checked all reconstructed subjects for errors in reconstruction and lGI-computation. To do I used the pial_lgi-file as an overlay in tksurfer and set the minimal threshold to 1. Using those settings no gray areas showed on the cortex, so I assumed all values had been computed correctly and no values below 1 are present. After the analysis I wanted to create scatter plots for the maximum vertices of the clusters that were found. When I displayed the scatter plots in tksurfer, lGI values below 1 were present in many of my subjects. This only seems to be a problem in vertices that are close to the corpus callosum, vertices that are further away show values well above 1 for all subjects. Have any of you already encountered this problem? If so, do you know if the values are in any way reliable? Could this be caused by the split of the hemispheres during the reconstruction process?

Thank you for your help!

Best regards,

Kai Ohmstedt