definetrial

[Robert Oostenveld]

On 26 Apr 2007, at 14:08, Diederick Stoffers wrote:

> The CTF dataset has been modified and now contains 160 trials with
> a length
> of 3.2 seconds and two markers (stimulus onset and trialtype) at 1
> second
> into the trial as well as a marker for artefacts.
>
> Could anyone please advice what to include in mytrialfun.m ? Is it
> only
> possible to use triggers (in that case I will have to convert
> markers to
> triggers) or can I also use the information in MarkerFile.mrk? I have
> attached a trialfun.m file which holds some of the information.

Hi Diederick,

There was no attachement to your mail. Please do
   event = read_fcdc_event(datasetdir)
and then

for i=1:length(event)
   disp(event(i));
end

What you will see is a long list of events, both with type=trial and
type=trigger. So not only the triggers but also the trials are listed
as events. You can combine them: i.e. for each trial-event look into
the corresponding trigger event and determine based on the trigger
value whether to include the trial. Also marker events (which are
stored in the CTF directory in a seperate file) thaht contain
artifacts will be listed as events.

An example trialfun is on http://www2.ru.nl/fcdonders/fieldtrip/
doku.php?
id=fieldtrip:documentation:making_your_own_trialfun_for_conditional_tria
l_definition

Robert

----------------------------------
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/fcdonders/fieldtrip.