[pymvpa] surface-based analysis in PyMVPA.

[Zhen Zonglei]

 Hi Michael:


       Thanks for reply. It sounds good. We will see what we can do.


Zonglei Zhen



On Tue, Jul 5, 2011 at 11:14 PM, Michael Hanke <mih at debian.org> wrote:

> Hi,
>
> On Tue, Jul 05, 2011 at 07:59:10PM +0800, Zhen Zonglei wrote:
> > Dear PyMVPAer:
> >
> > I have two questions about surface-based analysis in PyMVPA.
> >
> > 1.      Can the dataset mapper of PyMVPA handle surface-based data
> > automatically?
>
> As of today, there is no dedicated mapper for surface data. However, in
> most cases (if just access to the data is required) that is not
> necessary, because surface data is essentially already a 2D matrix that
> can be wrapped in a dataset right away -- no need for mapping.
>
> > 2.      Is there a convenient way to do surface-based searchlight
> analysis
> > in PyMVPA?
>
> Well, no -- or not entirely. The missing piece is a function that
> enriches the dataset of surface data with geometry information for the
> nodes. Like for the volumetric data, we need a coordinate per feature
> (or matrix column) to feed to the distance computing/checking machinery.
>
> I think the pieces are or ready to be stitched together. NiBabel has
> support for GIFTI data, PyMVPA interfaces to NiBabel, PyMVPA as a
> generic-enough way to generate searchlight ROIs on arbitrary
> dimensions/spaces -- it just needs some glue.
>
> I'd expect that sometime in the second half of this years, one of us
> will implement that, but anyone is welcome to contribute that code!
>
> Michael
>
> --
> Michael Hanke
> http://mih.voxindeserto.de
>
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