[Eeglablist] AMICA lrate gets stuck

[Makoto Miyakoshi]

Dear Felipe,

> What is the information given by the channel index? Spectral density
units? Or other units?


Channel index means which channel it is. Nth row in the EEG.data.


> Objectively, the scale of colors represents what?


It's a normalized power spectrum density, I believe.


> For instance, in terms of the 40.0Hz seen in the figure presented in my
last email, the zone of red/brown is the area of more intensity of that
frequency, corresponding to the channel FC6 (F8)?


Personally, I don't think the data you showed in the plot is
physiologically meaningful immediately. EEG signal should show 1/f spectrum
pattern which I don't see here.


> If we consider that the band of 40.0Hz is associated with a higher
engagement in the task, what does it means the greater intensity shown in
this area?


The interpretation depends on the experimental design. But, first of all
you want to confirm the basic sign of EEG.

Makoto


On Wed, Dec 2, 2015 at 3:58 AM, Filipe Melo <fmelo at fmh.ulisboa.pt> wrote:

> Hi Makoto
>
>
>
> What is the information given by the channel index? Spectral density
> units? Or other units?
>
> Objectively, the scale of colors represents what? For instance, in terms
> of the 40.0Hz seen in the figure presented in my last email, the zone of
> red/brown is the area of more intensity of that frequency, corresponding to
> the channel FC6 (F8)? If we consider that the band of 40.0Hz is associated
> with a higher engagement in the task, what does it means the greater
> intensity shown in this area?
>
>
>
> Best regards
>
> Filipe Melo
>
>
>
> *From:* Makoto Miyakoshi [mailto:mmiyakoshi at ucsd.edu]
> *Sent:* terça-feira, 1 de Dezembro de 2015 19:56
> *To:* Filipe Melo
> *Cc:* EEGLAB List
> *Subject:* Re: [Eeglablist] AMICA lrate gets stuck
>
>
>
> Dear Felipe,
>
>
>
> It's not a brain area yet, it's just scalp channel.
>
> You can pick up the channel that is showing the highest power spectrum
> density. If you open 'edit channel' -> '2-D channel location', click the
> channel label to obtain the channel index.
>
>
>
> Makoto
>
>
>
> On Mon, Nov 30, 2015 at 7:07 AM, Filipe Melo <fmelo at fmh.ulisboa.pt> wrote:
>
>
>
> Hi Makoto
>
>
>
> I’m working with Emotiv Epoc (EEGLAB software) and I need to quantify the
> area of activation of the different zones analyzed. Do you know a way to
> quantify the area of the different brain areas detected (by colors).
>
>
>
>
>
> [image: Description: fracisco carlos_dardo virtual_11 a 15.jpg]
>
>
>
>
>
>
>
>
>
> Thank you.
>
> Best regards
>
>
>
> Filipe Melo
>
>
>
>
>
> --
>
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>



-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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