[FieldTrip] Epoch using events from a different file

Arti Abhishek mailtome.2113 at gmail.com
Fri Sep 27 15:52:15 CEST 2019

Dear Jan-Mathijs,

Thank you for your email. I had a look at the documentation for
ft_redefinetrial and I am not sure where I  should give the event
information? I haven't used ft_definetrial earlier in the processing
pipeline. Does the event data structure (with fields type, value, sample,
offset, duration) be given as cfg.trials in fr_redefinetrial?


Date: Wed, 25 Sep 2019 08:06:57 +0000
From: "Schoffelen, J.M. (Jan Mathijs)" <jan.schoffelen at donders.ru.nl>
To: FieldTrip discussion list <fieldtrip at science.ru.nl>
Subject: Re: [FieldTrip] Epoch using events from a different file
Message-ID: <3512026C-F136-41FD-B03E-490BF8C7FBEF at donders.ru.nl>
Content-Type: text/plain; charset="us-ascii"

If you want to re-epoch data that is already in a fieldtrip structure, you
need to use ft_redefinetrial, rather than ft_definetrial. Please see the
help documentation of the function, and the website for more information.

Best wishes,

On Wed, Sep 25, 2019 at 5:25 PM Arti Abhishek <mailtome.2113 at gmail.com>

> Dear fieldtrip community,
> I am really stuck on how to use ft_definetrial when the data and events
> are in seperate MATLAB strctures (both in fieldtrip format). Please see my
> original question below. Any help would be appreciated.
> Thanks,
> Arti
> On Sun, Sep 22, 2019 at 11:44 PM Arti Abhishek <mailtome.2113 at gmail.com>
> wrote:
>> Dear field trip community,
>> I am trying to epoch an EEG dataset using events from a different  file
>> (ie, events are not present in the EEG file). I have preprocessed the EEG
>> and event information separately. The EEG data is in the fieldtript format
>> with the following fields;
>> hdr 1 x1 struct
>> label  64 x 1 cell
>> time 1 x 1 cell
>> trial 1 x 1 cell
>> I want to epoch the data using the event data (also in fieldtrip
>> compatible format) with fields
>> type, value, sample, offset, duration.
>> I couldn't find out how to do this. How do I  use ft_definetrial in this
>> case? All my attempts haven't worked yet. I could't find any example in the
>> website or in the discussion list. An example would be much appreciated.
>> Kind regards,
>> Arti
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