Hello all,
We applied a small volume correction (using a ROI image of the amygdala)
for a second level analysis (RFX) in SPM99 and got the following output:
STATISTICS: search volume: image mask: .\left_Amygdala.img
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cluster cluster cluster voxel voxel voxel voxel
p(cor) equivk p(unc) p(cor) T equivZ p(unc) x,y,z {mm}
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0.106 94 0.182 0.003 5.83 ( 4.02) 0.000 21 -9 -15
0.004 5.64 ( 3.94) 0.000 18 -3 -18
0.009 5.03 ( 3.68) 0.000 21 0 -21
table shows at most local maxima > 4.0mm apart per cluster
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Height threshold: T = 1.77, p = 0.049 (0.460 corrected)
Extent threshold: k = 0 voxels, p = 1.000 (0.460 corrected)
Expected voxels per cluster, <k> = 56.235
Expected number of clusters, <c> = 0.62
Degrees of freedom = [1.0, 13.0]
Smoothness FWHM = 12.1 12.3 12.3 {mm} = 4.0 4.1 4.1 {voxels}
Search volume: S = 3176 mm^3 = 118 voxels = 0.8 resels
Voxel size: [3.0, 3.0, 3.0] mm (1 resel = 68.15 voxels)
Since the the resel count is 0.8, what correction is applied to the P
values in the table above and is it valid?
thanks for your help,
Tsafrir
