Dear All,
I am fiddling with and have two questions regarding SnPM2 (version as of
this month).
Number one, if I try to analyze simple spm-first-level con-images,
during calculating the correct number of permutations, I get "No voxels
in brain" from snpm_cp. I use the multi-subject - single image standard
model, and altering the options does not change anything. I am quite
suprised since, on the first level, results are credible with 16 scans,
and all con-images look ok. Any hints?
Number two, I started to analyze cross-correlation images generated with
another software in snpm2. In some cases (n=16) I get a hugely
significant cluster (t=41.72) covering the whole brain. Again, all
images look technically ok. I thought that I do not have to do a
conversion of the r-images since snpm is non-parametric anyway, but
perhaps I am wrong? What else do I not see?
Thanks in advance,
Marko
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Marko Wilke (Dr.med./M.D.)
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Universitäts-Kinderklinik University Children's Hospital
Abt. III (Neuropädiatrie) Dept. III (Pediatric neurology)
Hoppe-Seyler-Str. 1, D - 72076 Tübingen
Tel.: (+49) 07071 29-83416 Fax: (+49) 07071 29-5473
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