[pymvpa] group-level analysis differences vs. pattern classification

Vadim Axel axel.vadim at gmail.com
Mon Sep 23 19:37:27 UTC 2013


BTW, if at first step I run conjunction analysis with contrasts A > C and B
>C; then, for ROIs resultant from conjunction analysis analysis, I  run
MVPA using the same data. Can I be accused by  N.Kriegeskorte in
double-dipping crime?


On Mon, Sep 23, 2013 at 9:20 PM, Yaroslav Halchenko
<debian at onerussian.com>wrote:

>
> On Mon, 23 Sep 2013, Vadim Axel wrote:
>
> >    Thanks for the answer.
> >    Suppose we trust 100% the conjunction analysis. Why do you think MVPA
> ROI
> >    analysis result will require more analytic support? If I have an ROI
> >    within a network of regions,  which decodes beyond chance, is it not
> an
> >    evidence that this region contains the relevant information?
>
> such a statement ("region contains the relevant information") indeed
> would have sufficient support from "MVPA ROI analysis"... I was
> discussing those additional statements, which I could have just
> misunderstood/mistreated: such as "common network" and "the difference
> between the two lies within this network" which sounded to me trying to
> dismiss the possibility that there could also be another location
> supporting this hypothesis.
>
> --
> Yaroslav O. Halchenko, Ph.D.
> http://neuro.debian.net http://www.pymvpa.org http://www.fail2ban.org
> Senior Research Associate,     Psychological and Brain Sciences Dept.
> Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755
> Phone: +1 (603) 646-9834                       Fax: +1 (603) 646-1419
> WWW:   http://www.linkedin.com/in/yarik
>
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