[Eeglablist] LIMO Design

[cyril pernet]

Hi Johannes,
>
> Dear All,
>
> i created a simple design matrix for 1st level analysis in LIMO.
>
>  I have 345 erp trials created with BrainVision-Analyzer and 
> transformed to eeglabs set-format with
>
> 3 different marker (260 trials with marker 1 , 44 trials with marker 
> 2 and 41 trials with marker 3)
>
> wich are given in a categorical_variable.txt file for LIMO (1 marker 
> per line, 345 lines) and corresponding to the trial-order of the set-data.
>
>  When i import set-data and categorical_variable.txt, LIMO gives me a 
> design looking different than i expect (see 
> www.altis-verlag.de/limo_design.JPG):
>
the design matrix looks ok to me - 1st column as 260 trials (white bit), 
then 2nd and 3rd colum with 44 and 41 trials
>
> There are about 90 trials for regressor 1, about 300 trials for 
> regressor 2 and about 300 for regressor 3.
>
you are 'reading' it the wrong way about - white = 1 black = 0 ; so it's 
all good
>
> Also the ERP plot (ERP options: Original) in LIMO seems quiet 
> different from the ERP plot in BrainVisions Analyzer.
>
this should simply plot the average of your condition but minus the 
grand mean across all 3 conditions - since this is what you are actually 
testing
you can check by typing 'all' when you select which condition to plot

cyril


-- 
Dr Cyril Pernet,

Academic Fellow
Brain Research Imaging Center
http://www.bric.ed.ac.uk/
Division of Clinical Neurosciences
University of Edinburgh
Western General Hospital
Crewe Road
Edinburgh
EH4 2XU
Scotland, UK

cyril.pernet at ed.ac.uk
tel: +44(0)1315373661
http://www.sbirc.ed.ac.uk/LCL/
http://www.sbirc.ed.ac.uk/cyril

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