[Eeglablist] Navigating ERP waves

Clement Lee cll008 at eng.ucsd.edu
Wed Sep 4 09:57:35 PDT 2019


My previous message didn't make it to the list but here it is again:

Hi Emmanuelle,

I'm moderating the eeglab list this month. Your previous message may have
been rejected because if it had attachments. In fact, I think you attached
some pngs to this email? Those may not be sent to the whole list; the best
way is to share links to them (google drive, image hosting site, etc.)

Best,
Clement Lee
Applications Programmer
Swartz Center for Computational Neuroscience
Institute for Neural Computation, UC San Diego
858-822-7535


On Tue, Sep 3, 2019 at 9:21 AM Emmanuelle Renauld <
emmanuelle.renauld.1 at ulaval.ca> wrote:

>
> Thank you Nathan. I actually tried to send this last week, and it didn't
> work so now I am sending it again. I was sending exactly the same two links
> as you did! ;)
>
>
>
> Thank you very much Stephen.
>
> For your first point, I was aware of that, I read the good book from Luck.
> Unfortunatelly, I didn't decide the task, and I don't have different
> stimulus conditions, only passive viewing of one type of cues. Eventually,
> the real goal of the study will be  to compare pre/post, so I will be able
> to make a comparison. But for now, we would like to analyse the baseline
> data alone (and test correlations with clinical scores). So I suppose I
> will have to decide some time windows visually from the peaks I see....
>
> The reference on the cap was on FCz. The re-reference to the average was
> the first step of my preprocessing so that's not something I can change at
> this point. I just have to make sure I understand the effect it can
> have.  I have read the discussion here:
> https://sccn.ucsd.edu/pipermail/eeglablist/2008/002510.html   and article
> here
> https://www.researchgate.net/publication/225165987_Issues_in_the_application_of_the_average_reference_Review_critiques_and_recommendations
> .
>
> But I still have trouble fitting this dipole information with our
> nomenclature for ERPs. Ex: I saw that P1 is generally stronger in
> posterior. How come I usually don't see something like "and the equivalent
> from this dipole was a N1 frontal".
>
> I have used ICA during the denoising, and when I saw heart components, I
> tried to remove them. I am sending you some snapshots for topoplots, and a
> plot of ERPs for all channels together on the same plot.
>
>
> Thanks again!
>
>
> Emmanuelle
>
>
>
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