[Eeglablist] logarithmic PSD using EEGlab study

[Makoto Miyakoshi]

Dear Mohammed,

This is again from 'help std_spec'

    'logtrials'  - ['on'|'off'] compute single-trial log transform before
                   averaging them. Default is 'off' for 'psd' specmode and
                   'on' for 'fft' specmode.

I don't know why it is 'off' by default for 'psd'.

> The resulted PSD is zero.

That's very strange. That sounds like a bug. Would you mind filing the
problem to EEGLAB Bugzilla?
https://sccn.ucsd.edu/bugzilla/enter_bug.cgi
I appreciate your cooperation and patience!

Makoto



On Mon, Sep 5, 2016 at 5:05 AM, Mohammed Jarjees <
m.jarjees.1 at research.gla.ac.uk> wrote:

> Dear all
>
> I want to compute power spectrum density (PSD) for 4 groups using EEGlab
> study structure. I want to use ‘psd’ as ‘specmode’.
>
> I have used the following codes
>
> [STUDY ALLEEG] = std_precomp(STUDY, ALLEEG, {},'interp','on','recompute','
> on','spec','on','specparams',{'specmode' 'psd' 'logtrials' 'off' });
>
> This code produce PSD without logarithmic transformation. When change the
> status of 'logtrials' from  'off' to ‘on’ as shown in the following codes
>
> [STUDY ALLEEG] = std_precomp(STUDY, ALLEEG, {},'interp','on','recompute','
> on','spec','on','specparams',{'specmode' 'psd' 'logtrials' *'on' *});
>
> The resulted PSD is zero.
>
> Can you please advise me with this?
>
> Many thanks
>
> Mohammed
>
> _______________________________________________
> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
> To unsubscribe, send an empty email to eeglablist-unsubscribe at sccn.
> ucsd.edu
> For digest mode, send an email with the subject "set digest mime" to
> eeglablist-request at sccn.ucsd.edu
>



-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20160909/8b71dd56/attachment.html>