[Eeglablist] the activity power spectrum of the ICA component looks not smooth

hui zhang hzhang.lib at gmail.com
Thu Jan 28 15:31:13 PST 2010


Cool! It's really helpful. Thank you all!

2010/1/26 Makoto Miyakoshi <mataothefifth at yahoo.co.jp>

> Dear Hui,
>
> Oh yes this is familiar to me. This is most probably because spectrum
> computation mistakenly calculate only the first trial of the data. I
> thought this was fixed in the updated version of EEGLAB. If you have a
> reason not to use the other versions, please check EEGLAB BUGZILLA 698.
> Below are the copy from there.
>
> spectopo.m line 650
>
> where, in my case, epoch_subset = [1 1 1 1 1 1...]. This analyzes only the
> first trial. This is unacceptably misleading, so let me report this as a
> blocker. I remember the same thing happened to me before and I fixed it for
> myself, but this time I totally forgot it and wondered what was wrong with
> my data. As a temporally solution, I added
>
> epoch_subset = find(epoch_subset == 1);
>
> in the line643 after 'else'.
>
> This does not happen when I use the ver. 6.01. I'm not sure though if this
> always happens.
>
> Makoto
>
>
>
>
> --- hui zhang <hzhang.lib at gmail.com> wrote:
>
> > Hi there,
> >
> > After  I run the ICA. The activity power spectrum looks not smooth
> > enough.
> > Please see the att.. Does anybody have any guess why it looks like
> > that?
> > What should I do then? Many thanks in advance!
> >
> > Best,
> > -Hui
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