[FieldTrip] select trial by previous trigger code

["Jörn M. Horschig"]

Hi Mads,

such things are possible if you write your own trial function. 
Basically, you need to read in the events (i.e. trigger values) and then 
make a selection based on that, see also here:
http://fieldtrip.fcdonders.nl/example/making_your_own_trialfun_for_conditional_trial_definition?s[]=trialfun
http://fieldtrip.fcdonders.nl/faq/what_is_the_relation_between_events_such_as_triggers_and_trials?s[]=trialfun

Hope that helps!
Best,
Jörn

On 6/18/2013 10:44 AM, Mads Jensen wrote:
> Hi all,
>
> I would like to know if it is possible select a trail based on the 
> previous trigger code?
>
> I got a dataset (MEG, neuromeg) where sometimes the subject just press 
> a button and sometimes a cue is shown and they then press the button, 
> the button presses are coded "1" and the cue "2". So, what I would 
> like is to datasets one with trials where there has been no cue and 
> one dataset where the trials that have cue is. Is that possible to do 
> automatically or do I have to do a "by hand"?
>
> best wishes,
> mads
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-- 
Jörn M. Horschig
PhD Student
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen
Neuronal Oscillations Group
FieldTrip Development Team

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