[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.

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


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

> 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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