[Eeglablist] epoching based on several triggers

[Arnaud Delorme]

Dear Mirek,

you can select multiple triggers in pop_epoch as pointed out by Steve but this will not help because when you provide several events, an inclusive or is applied { 'A' 'B' } means event type 'A' or event type 'B'. The easiest is to extract all data epochs, then create a STUDY with a single dataset. In the STUDY design, you will be able to select your condition and build a 2x2 design.

Best,

Arno

On Jul 9, 2012, at 5:34 PM, Stephen Politzer-Ahles wrote:

> Hi Mirek,
>  
> You should be able to choose multiple triggers in pop_epoch (at the command line you can do pop_epoch( EEG, {1 2 3 4}) or in the GUI you can Control+click multiple triggers); by default, however, I think this will make two epochs for each of what should be one epoch. Makoto's suggestion to rewrite the triggers is probably the best. Another option is that you could epoch the file based on only Word vs. Nonword triggers (assuming that all events have at least one of those, then you won't miss any epochs, and you'll still have the Correct vs. Incorrect information in EEG.epoch or for each epoch).
>  
> Best,
> Steve
> 
> On Fri, Jul 6, 2012 at 6:12 AM, mirek <3mirek at gmail.com> wrote:
> Hi all,
> 
> I just encountered a problem when creating epochs from continuous signal.
> To make it simple: I have two kinds of triggers marking two conditions:
> word vs nonword and correct vs incorrect responses. Each of the
> experimental stimuli in the file is marked with two simultaneous
> triggers. Is there a relatively simple way of defining epochs based on
> two simultaneous triggers? What I need to obtain are four kinds of
> datasets (word AND corr, word AND incorr, nonword AND corr, nonword AND
> incorr).
> In a pop_epoch() I can choose only one of them to define the epoch.
> I'm not sure if I missed something in GUI or should I start to write a
> script...?
> 
> Thanks a lot for any suggestion,
> 
> Mirek
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> 
> -- 
> Stephen Politzer-Ahles
> University of Kansas
> Linguistics Department
> http://www.linguistics.ku.edu/
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