[Eeglablist] [eeglablist] aliasing in pop_spectopo():

[Bradley Voytek]

Anders:

This is due to overflow errors due to the BioSemi DC offset. You have
to remove the channel means *correctly* before running spectopo.

See my same question and answer here:
http://sccn.ucsd.edu/pipermail/eeglablist/2008/002229.html

And this conversation:
http://sccn.ucsd.edu/pipermail/eeglablist/2008/002148.html

Good luck and let me know if you have any more questions!

::brad

On Mon, Oct 3, 2011 at 06:21, Anders Sand <engiltigadress at hotmail.com> wrote:
> Hi all,
> when I apply pop_spectopo(): (using the GUI) on any .bdf data I get what
> looks like aliasing (see http://www.mypicx.com/10032011/Aliasing/). I have
> tried importing the files via the biosignal toolbox and via converting (via
> polyrex) to .cnt. It looks the same for any .bdf file I open but looks
> normal for all example data attached with EEGLab. All frequency parameters
> are default.
> Could somebody help me troubleshoot this problem?
> Thanks
> Anders
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