[Eeglablist] what parameters should we use for spectopo?

[Makoto Miyakoshi]

Dear Doron,

It is known that if the data have large artifacts or large low-frequency
drift (i.e. 'baseline drift'), it affects the spectopo plot like that.
Apply high-pass filter around 0.1-1.0 Hz and try it again.

Makoto

On Fri, Dec 19, 2014 at 9:59 AM, Friedman Doron <doronf at idc.ac.il> wrote:

>  Hi,
>
>
>
> The bottom figure shows what we get with the default spectopo – this is
> what seems to be clean EEG with approx. 80 second duration from 64
> electrode data. The code is:
>
> figure; pop_spectopo(EEG, 1, [0  80000], 'EEG' , 'freqrange',[2
> 60],'electrodes','off')
>
>
>
> perhaps this is line noise or something – if we run a filter the noise is
> gone.  But what concerns me is that if we use if we use some other
> parameters we can get rid of it, without any filter, e.g, the top figure is
> generated by:
>
> figure; pop_spectopo(EEG, 1, [0  80000], 'EEG' , 'freqrange',[2
> 60],'electrodes','off','winsize', 1024, 'nfft', 1024);
>
>
>
> so - we would be happy to know what are the recommended parameters for
> spectopo.
>
>
>
> Link to figures:
>
> https://www.dropbox.com/s/xdj3nehwyegu9u0/fig.png?dl=0
>
>
>
>
>
> Thx!
>
>
>
> -          Doron
>
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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