[pymvpa] Searchlight on a vstack-ed dataset: Which imghdr to use for niftiresults?

[Usman Sheikh]

Hi PyMVPA gurus, 



This question more about nifiresults than it is about searchlight. 




Specifically, it's about the image header in this command: 




niftiresults = map2nifti(sl_map, imghdr=dataset.a.imghdr) 




Let's say I create a big dataset from three of a subject's sessions, using vstack, while setting 'a' argument of the function to 'all'. This will return me a dataset with imghdr as a tuple of all three imghdrs (and imgtype and mapper and all others in the same format as well). Now if I run searchlight on this stacked dataset, which imghdr should I use to get the corresponding accuracy map in nifti format? And what problems I might face if I just select the first of all the tuples i.e. imgtype[0] and mapper[0] and so on? 

Thanks in advance, 
Usman Ayub Sheikh 
Predoctoral Researcher 
www.bcbl.eu 

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