[Eeglablist] Differences between waves

Tarik S Bel-Bahar tarikbelbahar at gmail.com
Fri Aug 25 09:33:48 PDT 2017

Hello Heloiana,

The erps you showed look pretty weird, not like a classic stimulus-locked
ERP. SO there may some things incorrect in your pipeline or assumptions or

After checking you've made no errors and processed the data correctly, I
would say trust STUDY ERPs more. For differences between STUDY and
std_erpstudio, I recommend checking with the developer of std_erpstudio
(look in the plugin's documentation).

This may be a bug. If it's replicable with eeglab tutorial data, then
please send a bug note into eeglab bugzilla.

If you provide more details about your preprocessing and protocol that
would help for more suggestions.

If you haven't had a chance to yet, please be sure to review/do eeglab
tutorial with eeglab tutorial data.

Also, if you loaded continuous single-subject files into STUDY, you may
want to try with the (older) method of putting single-subjct epoched files
into STUDY.

On Tue, Aug 22, 2017 at 4:52 PM, Heloiana Faro <heloiana_14 at hotmail.com>

> Dear eeglab community,
> In my experiment I need to compare the ERPs from a component cluster
> comprised of two different groups ("BRANCA" and "PRETA", condition "S 4").
> I did that using two different eeglab options: the "plot ERP" from the
> STUDY menu, and the "std_erpstudio" plugin. However, I note some
> differences in the ERPs generated by these two methods. Would anyone know
> why? Also, the ERP waves seem odd - given my task, I would expect a visible
> ERP at 350-500 ms. I send a link with two pictures for you to see this
> difference. Thank you very much for your help!
> Best regards,
> Study picture: https://www.dropbox.com/s/4conxidgsuxqzwr/Screensho
> t%202017-08-21%2013.08.58.png?dl=0
> ERP Studio picture: https://www.dropbox.com/s/fhnv4mw0tofv60o/Screensho
> t%202017-08-21%2014.35.00.png?dl=0
> Heloiana Faro
> *Profa. Esp. Heloiana Faro*
> *Graduada em Licenciatura Plena em Educação Física (UEPA)*
> *Especialista em Treinamento Desportivo (ESMAC)*
> *Mestranda em Educação Física (UFRN)*
> *Membro do Grupo de Estudo de Biologia Integrativa do Exercício (GEPEBIEX)*
> *"Na crise, estude!"*
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