[Eeglablist] Navigating ERP waves

Emmanuelle Renauld emmanuelle.renauld.1 at ulaval.ca
Tue Sep 3 08:59:54 PDT 2019

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!



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