[Eeglablist] Why are power values different when a single channel is plotted vs multiple channels?

[Mikołaj Magnuski]

Ah, right, it is possible that only one of these functions respects
'boundary' events,
so the other one generates different spectrum due to discontinuities in the
signal.
Unfortunately, I do not remember which one is more careful about boundaries,
my guess is that pop_spectopo, passes 'boundary' latencies to spectopo
'boundaries' property so they are respected.
But Makoto or Arno should give you a more definite answer.


Pozdrawiam,
Mikołaj Magnuski


2013/3/17 Gan, Hock <h.c.gan at herts.ac.uk>

> The percent data tha I use is always 100%. I believe the discrepancy is
> due to manual rejection of artefacts which introduces boundaries of
> discontinuities. To enter these in the single channel case would be quite a
> task. I'm interested in what sort of processing differentiates the
> processing of boundaries.
>
> Thanks,
> Hock
> ________________________________________
> From: Mikołaj Magnuski [imponderabilion at gmail.com]
> Sent: 17 March 2013 11:31
> To: Gan, Hock; eeglablist at sccn.ucsd.edu
> Subject: Re: Why are power values different when a single channel is
> plotted vs multiple channels?
>
> Hey,
>
> make sure that in 'channel spectra and properties'
> the chosen 'percent of data to sample' is 100
> Otherwise running 'channel spectra and properties'
> twice can give you different results (but is faster).
>
>
> Mikołaj
>
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