[FieldTrip] Help Manually Defining Trials

Rodrigo Montefusco rmontefusco at med.uchile.cl
Mon Jun 29 15:02:00 CEST 2015

Hi Peter,
Maybe you can redefine (ft_redefinetrials) your trials (from one whole
continue trials to chunks of data) in segments that allow you to properly
resolve your frequencies of interest.
After that you can perform a trial rejection based on automatic or manual
artifact detection...then you can do whatever you need to do.
Could be other ways, but this for me looks very straight forward for at
least a first exploratory round of analysis.

I hope this helps you.



On Sun, Jun 28, 2015 at 11:51 PM, Peter Lyons <plyons at udel.edu> wrote:

> Dear All,
> My name is Peter Lyons, and I am a researcher at the University of
> Delaware.  Currently, I am conducting resting state EEG research with the
> intention of using Fieldtrip to calculate the power of different
> frequency bands as well as phase lag index between various sensors.  My
> dataset is a continuous recording sampled at 1000 hz for 30 minutes.  I do
> not have any events or triggers in my data.
> I would like to manually select the cleanest segments of my data following
> artifact rejection, and define them as trials.
> Theoretically, I see three ways to segment my data manually:
> 1.  Insert individual triggers throughout my data (at locations determined
> via ft_databrowser), and then define trials based on these triggers.
> 2.  Define trials based on a beginning and ending sample number.
> 3.  Use ft_databrowser to select segments of data as if they were
> artifacts, and then define these "artifacts" as trials instead of rejecting
> them from the dataset.
> Could anyone advise on how to code one of the above methods?
> Any help is welcome and appreciated!
> Thanks,
> Peter
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> fieldtrip at donders.ru.nl
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