[Eeglablist] How can I epoch events that preceded a specific response?

embar at super.lt embar at super.lt
Tue Aug 4 23:06:48 PDT 2015


Hi,

If you already epoched data with stimuli, you can select data with
particular respose:
EEG = pop_selectevent( EEG, 'type','1', 'deleteevents','off',
'deleteepochs','on', 'invertepochs','off').
To select all epochs, that do not contain '1', use change 'invertepochs'
option to 'on'.
You can try use EEGLAB plugin Darbeliai can do conditional epoching in GUI.
See https://github.com/embar-/eeglab_darbeliai/wiki/3.4.%20Complex%20epoching
Installation instructions
https://github.com/embar-/eeglab_darbeliai/wiki/2.%20Installation

--
Regards,
Mindaugas

> Dear all,
>
> I am comparing 2 groups of participants in 4 different conditions (videos
> with different audiovisual asynchronies).
> After each video, the participants were asked to judge whether the video
> just watched was in-sync (S1) or out-of-sync (S2).
> Is there a way of epoching events that were followed by an in-sync
> response separately from the ones that were followed by an out-of-sync
> response?
> I tried the code below for the in-sync responses (S1), without success..
>
> ep_lim = [-0.8, 2];
> tps = {EEG.event.type};
> corr_tp = find(strcmp('1', tps));
> prev_ev = corr_tp - 1;
> EEG = pop_epoch( EEG, {}, ep_lim, 'eventindices', prev_ev);
>
> Thank you for your attention!
>
> ana francisco
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