[Eeglablist] Interpreting Brodmann Area and Anatomical location of Domain in MPT analysis

[Makoto Miyakoshi]

Dear Mohammed,

Sorry for belated response.
I asked the question to Nima and obtained the following response.

1. The data come from two different atlases.
2. Any area less than 0.5 contribution is not shown (wihch is why they
don't sum up to 1).
3. For Brodmann area (in Talairach), it uses the closest cortical voxel.
Basal ganglia is removed from this.

Probably 1 and 2 explains the difference.

Makoto

On Sun, Sep 18, 2016 at 1:57 AM, Mohammed Jarjees <
m.jarjees.1 at research.gla.ac.uk> wrote:

> Dear all,
>
> I have used Measure Projection Toolbox (MPT) to analyse  motor imagery EEG
> data.  In some domains I get Brodmann areas contributing and corresponding
> anatomical areas which are not covering these Brodmann areas at all
> (example below). If they are complementary, then why BA adds up to 91% and
> anatomical areas up to  83%?
>
>
>
> *Brodmann areas*
>
> *Probability*
>
> BA 25
>
> BA 23
>
> BA 34
>
> BA 29
>
> BA 28
>
> 0.47
>
> 0.16
>
> 0.16
>
> 0.06
>
> 0.06
>
>
>
> *Total Probability*
>
> *0.91*
>
>
>
> *Anatomical areas*
>
> *Probabilities*
>
> L Caudate
>
> Brainstem
>
> R Caudate
>
> L Putamen
>
>
>
> *Total Probability*
>
>
>
> 0.29
>
> 0.23
>
> 0.17
>
> 0.14
>
>
>
> *0.83*
>
>
>
>
>
> I understand that anatomical areas can be wider than BAs, but shouldn't it
> anatomical areas cover BAs?
>
> How should I interpret this?
>
>
>
> Best Regards
>
> Mohammed
>
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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