Dear Sarb,
1. The F-contrast (effects of interest) shows only few small significantI recently encountered similar problems in one of my analyses (sparse and insignificant effects when I looked at the F spanning the space of all covariates, yet
regions at p<0.05 (uncorrected). However, if I look at the contrast c1-c2
(i.e. 1 0 -1 0 0 0), I get highly significant effects in those areas I
expected to see. How is it possible that I don't find these regions in the
F-map? (I think it is important to add that the contrast 0 0 -1 0 0 0 did
not show a significant effect either).
2. If I want to plot the adjusted data of the areas showing significantAs far as I'm aware, the timeseries data for these voxels is not retained, so all you can look at is the parameter estimates. I think you need to repeat your estimation, but change the F contrast threshold in the spm_defaults menu (it's in the 'defaults' button, under 'spm statistics'.) If you make this more lenient, your voxels should survive the cruel scythe of the F cut-off.
c1-c2 difference, it appears that this is not possible. I get the message
"no raw data has been saved at this location". I assume that this has to do
with the fact that there is no significant F-contrast at the same location,
and therefore no raw data has been saved there. Is there a way to plot these
data?
Best
Dave