Reply-To: | | [log in to unmask][log in to unmask]> wrote:
> What Nia said is correct. You have to create the F contrast mentioned; then > you can choose to adjust for that when you do a VOI. This is different than > specifying the contrast that you want an SPM of. > > Jana Basnakova wrote: > >> Dear Nia, >> >> thank you for your reply, although I am afraid that my problem is >> something slightly different. >> I actually did specify a contrast for the subject (that's a prerequisite >> of extracting VOI timecourse). However, in the next step - when I select a >> VOI and want to calculate the timecourse of that contrast - there is a field >> where you should specify adjustment and select 'effect of interest', >> according to the SPM guide (there are other options as well, for example "no >> adjustment", which I think is the default option). >> >> Jana >> >> >> >> On Tue, Sep 7, 2010 at 5:41 PM, Nia Goulden <[log in to unmask]<mailto: >> [log in to unmask]>> wrote: >> >> Dear Jana >> The effects of interest contrast needs to be specified manually. >> The effects of interest contrast is an F contrast specified by >> entering the identity matrix (i.e. a matrix of 0s with 1s along >> the diagonal) with the same number of rows and columns as >> conditions in your design matrix. >> Hope this helps >> Nia >> >> *From:* Jana Basnakova <[log in to unmask] >> <mailto:[log in to unmask]>> >> *To:* [log in to unmask] <mailto:[log in to unmask]> >> >> *Sent:* Tue, 7 September, 2010 16:23:29 >> *Subject:* [SPM] extracting VOI - 'adjust data' problem >> >> Hi, >> >> I want to extract a VOI in order to do a PPI analysis in SPM5. I >> am following the steps in the manual - I selected the desired >> contrast at the single subject level, chose a voxel, pressed >> "eigenvariate" and then typed in the name of the region (BA44, in >> my case). Next, I am supposed to adjust the data for "effects of >> interest". >> However, this step does not seem to work - when I press "enter" >> after naming my VOI, it skips this field and I automatically get >> to the next field, asking me which for session I want to extract >> the VOI (I had several blocks in my experiment). The field where I >> am supposed to choose the adjustment is automatically filled in >> with "no adjustment". >> >> Is this supposed to be so (why) or am I doing something wrong? >> >> Thank you! >> >> Jana >> >> >>[log in to unmask] |