[pymvpa] Combine the fMRI data with other data in the pattern analysis?

[Francisco Pereira]

Hi Nynke,

Without wishing to make a "commercial" pitch, Searchmight has that as
an (undocumented) feature because of local requests. If it's something
you desperately need I can help you use that. It shouldn't be hard to
implement, though there are issues with making sure that the range of
values the extra variable takes are comparable to those from the
voxels (judging by our experience). A different consideration is
whether the classifier can use the value of the extra variable to
change the way it uses the others; at first thought I'm not sure a
linear classifier will do there (but could well be wrong).

cheers,
Francisco

On Mon, Mar 14, 2011 at 9:49 AM, Nynke van der Laan
<nynkevanderlaan at gmail.com> wrote:
> Hello,
> I have a question concerning searchlight analyses: Is there a build in
> possibility in pyMVPA to add an extra variable to the pattern
> analysis? E.g., if you have for each sample, next to the neuroimaging
> data also skin conductance measures (1 per sample/scan). Would it be
> possible to add this variable as a covariate to be able to see whether
> this variable can improve the prediction accuracy? So when you run an
> analysis with only the functional scans, and one with both the skin
> conductance and the functional scans, you can see whether that adds
> any information.
> Thanks in advance for answering my question!
> Best regards,
> Nynke
>
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