[pymvpa] search-light vs. ROI analysis: significance puzzle

Vadim Axel axel.vadim at gmail.com
Tue Feb 26 12:09:16 UTC 2013

Indeed, very similar - I only make it not random, but rather sequentially
iterating over all brain. In such a way each voxels participates in roughly
the same amount of lights. I could not figure out from paper, Malin, in how
many lights the voxel should participate in order to achieve satisfactory

On Tue, Feb 26, 2013 at 3:47 AM, Malin Björnsdotter <
malin.bjornsdotter at neuro.gu.se> wrote:

> > In my method, the hitrate is assigned to all the
> > voxels in the light and given that each voxel participates in many
> lights,
> > the hitrates are averaged. So, using my method a voxel hitrate reflects
> many
> > possible environments. I try to compare the results of both and so far it
> > seems that with your method the results are more patchy.
> That sounds pretty much exactly as what I've been doing. :-) Jo has an
> excellent blog entry about this:
> http://mvpa.blogspot.sg/2012/09/random-searchlight-averaging.html
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