Hi Doug,

Many thanks for your valuable answer. Can you please briefly explain some other issues:

1). what exactly means Correction for Multiple Comparisons and how this is done when using --sim method with --cache.

2). do I need to do an estimation  FDRthresholding in tksurfer for GLM method before running the --sim?           

3).I know that adding cwpvalthresh .025  shows only clusters p<.025 but then what means cluster significance  values not corrected for 2 spaces? I found this on the slides posted on-line.

Many thanks and have a great day!

Antonella