Hi Jayne,

Do you mean an ordinary cluster (as a spatial cluster) after a threshold has been applied? The cluster as a whole is meant to be considered significant or not, but you can get a measure of spatial variability if you compute the standard deviation of the effect size across voxels of that cluster.

Regarding variability across subjects that entered into the analysis, the variability isn't defined for the clusters, but for the individual voxels. This variability (standard error) is in the VARCOPE file (from FEAT). You can also use the command fsl_glm with the option "--out_varcb".

All the best,

Anderson

On 26 March 2015 at 16:28, Jayne Morriss <[log in to unmask]> wrote:

Hi,

I was wondering whether there is anyway of calculating how far each single subject's activation pattern is away from a group level cluster. If this information exists, where and how can I get to it? This would give me an idea of how heterogeneous or homogenous activation is for a given cluster.

Many thanks,

Jayne Morriss
CINN
University of Reading