[Eeglablist] I: pop_spectopo specified channels, winsize and nfft

[Makoto Miyakoshi]

Dear Alessandro,

> but it does not seem possible to select time ranges.

That should be done by using pop_select(). From main EEGLAB GUI, 'Edit' ->
'Select data'...

Makoto

On Tue, Aug 4, 2015 at 1:00 AM, alessandro.marassi at libero.it <
alessandro.marassi at libero.it> wrote:

> Dear Makoto,
> maybe I missed something.
> I need to plot single channel spectra computed in specified epochs' time
> ranges (baseline and task), possibly choosing winsize and nfft parameters
> for the spectra computation. I have then to subtract baseline spectra from
> task spectra.
> I would like to perform this operation both in single epochs and in a set
> of data epochs identified by an event (StimulusBegin) and previously
> extracted via the EEGlab GUI menu.
>
> As far as I know, spectopo plots the mean log spectrum of a set of data
> epochs, but it does not seem possible to select time ranges. It lets you
> choose single channels, winsize and nfft.
>
> Pop_spectopo plots spectra of specified data channels or components. It
> calls spectopo().
> It lets you choose time ranges, but it does not seem possible to select
> single channels nor to choose winsize and nfft.
>
> If pop_spectopo is applied to the extracted epochs identified by an event (StimulusBegin),
> is it possible (and how) to compute spectra over a set of data epochs?
> How can I practically proceed to get the result I need?
> Should I modify pop_spectopo code?
> Could you please give me an example script?
>
> Thanks,
> Alex
>
> Dear Alessandro,
>
> >* Is it possible to plot with pop_spectopo only specified channels as they
> *may be chosen in:
> [spectra,freqs] = spectopo(EEG.data(8,:), 0, EEG.srate, 'winsize', 256,
> 'nfft', 512); %
> possibly setting as well winsize and nfft in the same way as with the above
> spectopo call?
>
> Sure, why not?
> Just be careful not to be confused with the difference between pop_spectopo
> and spectopo.
>
> Makoto
>
> ----Messaggio originale----
> Da: alessandro.marassi at libero.it
> Data: 02/08/2015 23.46
> A: <eeglablist at sccn.ucsd.edu>
> Ogg: pop_spectopo specified channels, winsize and nfft
>
> I have to plot single channel spectra computed in specified epochs' time
> ranges such as:
> pop_spectopo(EEG, 1, [-1000      0], 'EEG' , 'percent', 15, 'freqrange',
> [2 25], 'electrodes','off'
>
> Is it possible to plot with pop_spectopo only specified channels as they
> may be chosen in:
> [spectra,freqs] = spectopo(EEG.data(8,:), 0, EEG.srate, 'winsize', 256,
> 'nfft', 512); %
> possibly setting as well winsize and nfft in the same way as with the
> above spectopo call?
>
> As regards channels I tried to follow what has been suggested in:
> http://sccn.ucsd.edu/pipermail/eeglablist/2011/004445.html
> using an additional parameter " 'mapchans', 1:10 ", but without success.
>
> thanks,
> Alex
>
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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