preprocessing without trigger...

[Marco Rotonda]

Hi there,
it could be a stupid question but I don't know how to solve it.
I wish to analyze some data files I have (continuous signal, without any
trigger).
These data sets are 3 minutes of neurofeedback training and there are no
trigger.
I just want take all the 3 minutes and take each second overlapping 500ms.
The point is that there are no trigger so I don't know how to do the
preprocessing (where I have to specify the trigger, isn't it?).

Thanks in advance

----------------------------------
The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.