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Hi,

In both cases, a threshold is applied to the statistical map (for example, t = 3). For each surviving cluster of voxels, a new test statistic is calculated. This test statistic can be:

a) The number of voxels in the cluster. This is the "cluster extent" or "cluster size".
b) The sum of the t-statistics of all voxels inside the cluster. This is the "cluster mass".

In both cases, the p-values are computed using permutations in randomise.

All the best,

Anderson
 

On 10 April 2018 at 05:08, M del Mar Velasco <[log in to unmask]> wrote:


 

Dear all,


I wonder what is the difference between cluster-size-based thresholding and cluster-mass-based thresholding in randomise command.


Thanks very much,


M del Mar