Hi all,

I have 35 lesion masks which I am analysing in terms of behavioural performance using NiiStat. I would like to use the 'Regress Lesion Volume' setting to, well, regress the lesion volume out of the analysis. However I get an error saying 'Problem regressing for lesion volume! Subject [ppt code].nii does not have the field ".lesion.dat"' for every participant. 

My question then is: how do I create this .lesion.dat file for my data? I can find the volume of the lesion masks using FSL - but how do I then associate it with the files used for NiiStat? Even just seeing the structure of a .lesion.dat file would be useful. I cannot find anything about it online!

TIA,
Lucy