Hi makoto, 

I'm not sure if I fully understand your question, but I think that you are referring to the distinction between the cluster mass and cluster extent statistics. For cluster mass, we add the test statistic across connections that comprise the connected component and that yeilds the statistic for the connected component. The threshold can then be substracted from the statistic so that the statistic reflects how much of an effect we have above and beyond the threshold. But it is not essential to subtract the threshold. I hope that I have understood your question correctly. 

Andrew

Originally posted by Makoto HAGIHARA:

Hi,

 

I’m using the NBS toolbox to analyze differences between the results of two task conditions, in which I have two representative connectivity matrices for each subject. Regarding calculating the component size “intensity”, why does the NBS add up the t-values of each component minus the threshold value? I referred to the calculation of the variable test_stat_mat in the file NBS.stats.m. I would like to know the difference between this method and the calculation method that adds up the t-values of each component as they are, without subtracting the threshold.

 

Thank you for your time. I look forward to hearing from you soon.

 

Best regards,

 

Makoto