[FieldTrip] definetrial with ANT .cnt files

["Jörn M. Horschig"]

Hi Michael,

it might help if you set cfg.trialdef.eventtype = '?' and check what 
triggervalues and -types FieldTrip actually detects. Maybe the triggers 
are not saved as numeric values but as characters, thus maybe you need 
to set eventvalue = '1' instead of =1? FieldTrip can be sensitive to 
those kind of things. For example, our BVA-files record triggers are 
stored as 'S   1', and you need to add the two white spaces between the 
'S' and the '1' when defining cfg.trialdef.eventvalue, otherwise desired 
and actual triggervalues do not match.

Best,
Jörn

On 10/8/2013 5:50 PM, Epstein, Michael wrote:
>
> Hi all,
>
> I'm having a problem defining triggers using ft_definetrial  with ANT 
> .cnt files. Say I want to do a simple epoching around events with a 
> trigger code of 1 - when I put in cfg.trialdef.eventvalue = 1; I get 
> an error saying no trials are defined. However I figured out that if I 
> put in cfg.trialdef.eventvalue =[1char(0) char(0)]; then it works 
> fine. The trigger files look totally normal, and other programs don't 
> seem to have this issue. Anyone else ever have a problem like this?
>
> Thanks,
>
> -Michael
>
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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

P.O. Box 9101
NL-6500 HB Nijmegen
The Netherlands

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