[Eeglablist] Baseline from outside the epoch period

[Delorme, Arnaud]

Dear Haneen,

In EEGLAB graphical interface, you might want to extract large epochs time-locked to the visual cues that encompass both the visual cues and the collisions plus at least 2 seconds. Then remove the baseline of your choice. After that, you can re-extract sub-epochs -2 to 2 seconds from the collision point - this time do not remove any baseline.

Hope this helps,

Arno

> On Jan 14, 2020, at 12:20 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu> wrote:
> 
> Dear Haneed,
> 
> The default EEGLAB does not support it unfortunately.
> If you absolutely need to do it, then you have to do it outside EEGLAB GUI
> operation by coding. In doing so, use bsxfun() in this way
> 
> EEG.data = bsxfun(@minus, EEG.data, mean(baselineData(:,time1:time2,:),2));
> 
> 'baselineData' is your 3-D data including baseline period defined by
> time1:time2. Just one line of code!
> 
> Makoto
> 
> On Mon, Jan 13, 2020 at 11:20 PM Haneen Alsuradi <haneen at nyu.edu> wrote:
> 
>> Hi,
>> 
>> I did an experiment in which I have two events, one for a visual cue that
>> indicates the start of the trial (a ball on the screen which will be used
>> in the trial itself) and the second one is when a collision happens for the
>> ball. I am interested in studying the brain activity after the collision
>> and thus I will epoch -2 to 2 from the collision point. However, I think it
>> is suitable to baseline my epoch before the visual cue and not before the
>> collision. The time between the visual cue and the collision is user
>> dependent. Is there anyway I can specify my baseline outside the epochs?
>> 
>> Thanks
>> Haneen
>> _______________________________________________
>> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
>> To unsubscribe, send an empty email to
>> eeglablist-unsubscribe at sccn.ucsd.edu
>> For digest mode, send an email with the subject "set digest mime" to
>> eeglablist-request at sccn.ucsd.edu
>> 
> _______________________________________________
> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
> To unsubscribe, send an empty email to eeglablist-unsubscribe at sccn.ucsd.edu
> For digest mode, send an email with the subject "set digest mime" to eeglablist-request at sccn.ucsd.edu