[Eeglablist] eeglablist Digest, Vol 116, Issue 40

Erickson ericksonb.eng at gmail.com
Mon Jun 23 18:40:09 PDT 2014


Hi Eddy,
The question about what difference if any exists between the interpretation
of power and power density is near and dear to my heart as well, and is
currently under discussion here on the list:

http://sccn.ucsd.edu/pipermail/eeglablist/2014/008224.html

To extract numerical values from Spectopo, look at the variables it creates
- I believe one is "spectra" which contains the power density values, and
the other is "freqs" which contains the corresponding frequency markers so
you know what bin lines up with what frequency.

Brian


On Mon, Jun 23, 2014 at 3:53 PM, <eeglablist-request at sccn.ucsd.edu> wrote:

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>    1. Numerical power values (Eric Ger)
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> ---------- Forwarded message ----------
> From: Eric Ger <greyjoyx at gmail.com>
> To: eeglablist at sccn.ucsd.edu
> Cc:
> Date: Mon, 23 Jun 2014 14:30:50 -0400
> Subject: [Eeglablist] Numerical power values
> Hi,
>
> I've been trying to find a method (within EEGLab) through which I can
> extract numerical values for power (in dB or mV^2) in an epoched (and ICA
> cleaned) .set file and I am unable to do so. spectopo () plots the power
> density (log of mV^2/Hz) with frequency (Hz) which might also be useful,
> but I am unable to extract numerical values from that plot as well. Is
> there a function that allows for specification of baseband (e.g. Alpha
> ~8-10 Hz) and outputs the power values within that baseband for each
> channel (similar to how BESA performs this operation)? Can 'spectopo'
> output such values? What sort of calculation/transformation is performed to
> obtain such values with 'spectopo' (if at all)?
>
> Thanks,
>
> Eddy
>
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