[Eeglablist] Huge alpha peaks in one person

Simon Finnigan finnigan.simon at gmail.com
Mon Apr 6 16:17:24 PDT 2015

Hi Eric

I think it could well be due to inter-individual variability; I have seen
this kind of thing before in past studies. In fact in one longitudinal
study, I observed a "high alpha power" individual - and their EEG power
spectrum showed essentially the same [high alpha power] phenomenon at each
of three annual EEGs.

If you take a look at their raw EEG trace, this might help confirm that
what you're seeing is not due to pre-processing [?].

Regards, Simon

On Sun, Apr 5, 2015 at 7:14 AM, Eric HG <erichg2013 at gmail.com> wrote:

> Hi everybody,
> There has been one resting-state EEG from a healthy subject that we have
> analyzed that has huge alpha peaks resulting in huge power values at
> baseline (like 15-17) in the alpha band and this is only when the subjects
> have their eyes closed. Has anyone experienced something like this? Could
> it be due to the preprocessing steps (I've used Butterworth filter: H-pass:
> 1 Hz and L-pass: 100 Hz, epoched the data and then removed the epochs with
> a lot of artifacts)?
> The ICA can easily separate the alpha peak components.
> Or can it just be due to individual variability?
> Best,
> Eric
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