[Eeglablist] ERP study

Stephen Politzer-Ahles politzerahless at gmail.com
Tue Aug 22 19:49:06 PDT 2017

It's not very clear to me what specific hypothesis you are trying to test
--- "find if there is correlation between these Colors and Notes" is a bit

Regarding your other questions:
You never "have" to use a specific set of channels, but it is good to focus
on some that you have an *a priori* prediction about. (On the other hand,
if you specifically want to show that the effect is limited to a certain
region --- e.g., if you want to claim that an effect is "frontal" or
something --- then you also need to test other channels, to show an
interaction such that an effect is present in one place and not another.)
These *a priori* predictions will usually come from what is expected based
on previous studies.
As for re-reference, yes, you can always re-reference to different channels
and then get back you original reference channel. There are consequences to
which reference you use, so you should look at previous papers studying
similar topics as you and see what reference channels they chose, and why.
There are also some papers and books discussing the pros and cons of
different reference choices (e.g., Luck 2005/2014).


Stephen Politzer-Ahles
The Hong Kong Polytechnic University
Department of Chinese and Bilingual Studies

On Tue, Aug 22, 2017 at 4:46 PM, Konstantina Tsekoura <
tsekou at ceid.upatras.gr> wrote:

> Hello everyone,
> I carried out an experiment with emotiv epoc+ headset(14 channels) for my
> undergrad thesis that i show to participants a video with Colors and
> Musical Notes and i would like to preprocess these data and find if there
> is correlation between these Colors and Notes.
> Arround the internet i found some papers related to channel selection for
> Color Classification and some other papers using musical notes to their
> experiments and the first ones using temporoparietal channels and the
> second P3,P4,O1,O2, so i think that i have to use T7,T8,P7,P8,01,02.
> Am i right?
>  p3/p4 are the referrence channels in emotiv's headset. can i use them in
> some way? Can i re-referrence my data in other channels so to use P3/P4 and
> if yes, in which channels can i re-refference them?
> Sorry for wasting your time with maybe some newbie questions but i am real
> troubled with this.
> Any suggestions and/or advice will be greatly appreciated.
> ~Konstantina
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