[Eeglablist] newtimef question

[Arnaud Delorme]

Dear Marine,

When you use newtimef in this way to compare conditions, the function recomputes a common baseline between the two conditions (you can disable that feature if you want). This explains the difference you observe.

Best,

Arno

> 
> ---------- Forwarded message ----------
> From: Marine Vernet <mvernet at bidmc.harvard.edu>
> Date: Sun, Jul 3, 2011 at 3:16 PM
> Subject: [Eeglablist] newtimef question
> To: eeglablist at sccn.ucsd.edu
> 
> 
> Dear all,
> 
> Using the newtimef function to compare different datasets, I realized that the results of one dataset were not constant when compared with various datasets.
> 
> For example, I obtained different plots (and different values within the output variable) for dataset1 in the three cases below:
> 
>     erps1=newtimef( {dataset1  dataset2}, 1160, [-200  599], 1450, 0, 'topovec', 27, 'elocs', dataset1.chanlocs, 'chaninfo', dataset1.chaninfo,...
>         'baseline',[-200 0], 'plotphase', 'off', 'padratio', 1,'freqs',[8 50],...
>         'erspmax',3,'itcmax',1,'erplim',[-20 20],'itcavglim',[0 0.6],'speclim',[-15 5],'erspmarglim',[-5 6],... 
>         'alpha', 0.05);
>     
>     erps2=newtimef( {dataset1  dataset3}, 1160, [-200  599], 1450, 0, 'topovec', 27, 'elocs', dataset1.chanlocs, 'chaninfo', dataset1.chaninfo,...
>         'baseline',[-200 0], 'plotphase', 'off', 'padratio', 1,'freqs',[8 50],...
>         'erspmax',3,'itcmax',1,'erplim',[-20 20],'itcavglim',[0 0.6],'speclim',[-15 5],'erspmarglim',[-5 6],... 
>         'alpha', 0.05);
> 
>     erps3=newtimef(dataset1, 1160, [-200  599], 1450, 0, 'topovec', 27, 'elocs', dataset1.chanlocs, 'chaninfo', dataset1.chaninfo,...
>         'baseline',[-200 0], 'plotphase', 'off', 'padratio', 1,'freqs',[8 50],...
>         'erspmax',3,'itcmax',1,'erplim',[-20 20],'itcavglim',[0 0.6],'speclim',[-15 5],'erspmarglim',[-5 6],... 
>         'alpha', 0.05);
> 
> I there any reason for that?
> 
> Thanks in advance for your help,
> 
> Best regards,
> 
> Marine
> 
> 
> 
> 
> -- 
> Marine Vernet, PhD
> 
> Berenson-Allen Center for Noninvasive Brain Stimulation
> Beth Israel Deaconess Medical Center, Harvard Medical School
> 
> mvernet at bidmc.harvard.edu
> 
> 
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> 
> 
> -- 
> Scott Makeig, Research Scientist and Director, Swartz Center for Computational Neuroscience, Institute for Neural Computation & Adj. Prof. of Neurosciences, University of California San Diego, La Jolla CA 92093-0559, http://sccn.ucsd.edu/~scott
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