[FieldTrip] ft_redefinedata after pre-processing

[Silvia Formica]

?Dear all,


I'm in need of suggestions on the correct analyses strategy for my data.

I have an experiment with a cue followed (after ~2 seconds) by a target.

I epoched the data cue-locked and pre-processed my dataset. In my preprocessing I'm downsampling, re-referencing, rejecting some trials, running ICA, etc etc.


My problem is that I would want to also epoch my data target-locked, but I want to do it after pre-processing the cue-locked dataset. This is because I want to exclude the same trials and apply exactly the same corrections to the two different datasets.


I tried to use the function ft_redefinetrial, creating the new probe-locked trial definition and applying it to the cue-locked dataset.


cfg=[];

cfg.trl=trl;                            # trl contains the trial definition of target-locked epochs


data_target = ft_redefinetrial (cfg, data_cue)



But I do not obtain what I wished for, because I get a data_target dataset that doesn't account for the trial rejection I performed while pre-processing the cue-locked dataset.


So my questions are:

1) is it possible to achieve my goal?

2) If yes, what is the right strategy to do it?


Thanks for any input and suggestion!


Best,

Silvia


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