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

[Alice Grazia]

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!