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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 >