[Eeglablist] EEGLAB: Epoching and ICA. In which order?

Clement Lee cll008 at eng.ucsd.edu
Tue Sep 10 10:00:07 PDT 2019

Hi Alice,

 I cannot have a good visualisation of the ICA components (only the maps
> and components scroll).

After ICA, you can epoch before looking at the components (performing
component rejection, etc.). This way, you have the same time-locked
visualizations as if you were to epoch before ICA.

Clement Lee
Applications Programmer
Swartz Center for Computational Neuroscience
Institute for Neural Computation, UC San Diego

On Tue, Sep 10, 2019 at 9:52 AM Alice Grazia <alicegrazia94 at gmail.com>

> Hi all,
> I have this doubt that I could not solve by myself. Maybe it is more a
> theoretical question than a programming question, but I'm performing
> time-frequency analysis with EEGlab software for my master thesis and I'm
> not sure whether it is more correct to perform ICA and epoching in a
> precise order. I found some recommendations (EEGLAB tutorial 2004) saying
> that it is advisable to perform ICA on a greater amount of data as
> possible. However, if I run ICA on EEGLAB before epoching, I cannot have a
> good visualisation of the ICA components (only the maps and components
> scroll). Instead, I have seen in a tutorial by Mike Cohen, that he performs
> epoching before ICA, so there is the possiblity to look at each component
> latency and frequency before rejecting. Personally, I found myself better
> with the second method, but I am not sure wheather it is correct or not.
> I hope you can help me in this dilemma! Thank you!
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