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

Alice Grazia alicegrazia94 at gmail.com
Wed Sep 11 02:44:13 PDT 2019


Thank you all for the useful answers!!

Best Alice

Il giorno mar 10 set 2019 alle ore 21:40 Xiaonan L. Liu <
liuxiaonan87 at gmail.com> ha scritto:

> Hi Alice,
>
> It seems to me there's no absolute right or wrong protocol for this . I
> usually prefer doing epoch before ICA and the reason is by epoch, you can
> get rid of noisy portions of your data (e.g. at the beginning, breaks and
> the end etc). It seems to me what's really important is you need clean data
> in order to get good ICA decomposition and epoch is somewhat a way to get
> cleaner data.
>
> Best,
> Xiaonan
>
> On Tue, Sep 10, 2019 at 9:53 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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