[Eeglablist] EEGLAB preprocessing for sleep EEG data

Tarik S Bel-Bahar tarikbelbahar at gmail.com
Mon Aug 14 11:51:23 PDT 2017

​Hello, brief notes below:

you can put all the data from one session into ICA, after appropriately
pre-processing the data to remove big artifacts that ICA does not like. The
boundary events are no problem, as ICA in eeglab mixes up all data points,
and is focused primarily on spatial patterns.

Regarding your events, and 1-2 minutes of data before each event: This
seems like very short periods and would likely lead to a not-that-great ICA
solution. I would say worry about that after you've achieved ICA solutions
for each subject, using as much clean data as you have for each participant.


On Tue, Aug 1, 2017 at 11:32 PM, EEGLAB User <eeglabuser at gmail.com> wrote:

> I have a 29-channel EEG data from overnight sleep recordings (~8 hours of
> EEG data). The EEG data is not continuous as I have paused it if the
> subject needed a loo break (~5-10 minutes) or to check the impedance (~2
> minutes). This inserts a ‘boundary event’ in my EEG data. On some
> occasions, I have also reapplied a couple of electrodes if the impedance
> was high. In addition, sometimes I have had to stop the EEG recording and
> start again due to some technical reasons, because of which I have two EEG
> files for the same subject during the same night i.e. same session.
> In my experiment, I have 15-20 events overnight and plan to use 1-2 minute
> data before each event for preprocessing and analyses. I would like to use
> ICA to correct for artifacts but before I do that, I would like to know if
> I need to split the data at each ‘boundary event’ and process them as
> separate EEG files? Or can I just consider the EEG recording from each
> subject as a single EEG recording and perform ICA (I can append the EEG
> files in cases where I have two EEG files per subject in the same session)?
> Any suggestions will be highly appreciated as I am very new to EEG and
> Thanks!
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