[FieldTrip] question about to get the numbers of rejected trials

Johanna Zumer johanna.zumer at gmail.com
Sat Jul 20 21:45:44 CEST 2013

Dear Lei,

I think that you are asking that you want to run the steps again, with
prestim =0.5 but with rejecting the same 10 trials that you already have
decided to reject?   If so, the numbers of rejected trials should be inside
data_reject.cfg  (or possibly data_reject.cfg.previous).   But note that by
including more prestim time, you might also find a need to reject more
trials if there is an artifact in the new included prestim time-points.
 If you use ft_redefinetrial, I think you only would shift where the time
0.0 is, but not add more data to each trial, so it depends which you want
to do.

Best regards,

2013/7/18 Lei Niu <lei.niu at einstein.yu.edu>

>  Dear Fieldtrippers,
> I am new one to use the fieldtrip, and have a question about the rejected
> trials.
> To be simply, let we say:
> 1) the original data is data_org, one singal trial in 32 channel, with 2
> different trigger codes and 100 trials per trigger.
> 2) I process the data to the data_stimulus, incuding 200 trials. Each
> trial has prestim = 0.1,
> poststim = 1;
> 3) I do ft_rejectvisual to reject 10 trials, 5 for each trigger. Then I
> get data_reject, including 190 trials.
> Here is the problem. I found the prestim is too short, I want to increase
> the prestim time to 0.5. How can I get the numbers of rejected 10 trials to
> do ft_redefinetrial?
> Thanks,
> Lei Niu
> Albert Einstein College of Medicine
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> fieldtrip at donders.ru.nl
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