[FieldTrip] Filtering before epoching

[jan-mathijs schoffelen]

Hi Matt,

Yes, it's possible. The only thing you should change in your approach is step 3: use ft_redefinetrial, rather than ft_preprocessing

So:

1. Preprocessing step on continuous data with filtering.
cfg=[];
cfg.dataset  = 'raw_data.fif';
cfg.bpfilter  = 'yes';
cfg.bpfreq    = [a b];
data = ft_preprocessing(cfg);

2. Define trial.

cfg = [];
cfg.dataset = 'blabla';
cfg.trialdef.xxx etc some settings here.
cfg   =  ft_definetrial(cfg);
  
trl = cfg.trl;

3. Preprocessing step for epoching data on filtered data.

cfg = [];
cfg.trl = trl;
final_data = ft_redefinetrial(cfg,data);


Best,
JM

On Dec 9, 2013, at 6:31 PM, Matthieu Rolland wrote:

> Hi everybody,
> 
> Is it possible to filter data prior to epoching? And more generally is it possible to epoch data that has already been preprocessed?
> 
> I have tried without success many variations of this:
> 
> 1. Preprocessing step on continuous data with filtering.
> cfg=[];
> cfg.dataset  = 'raw_data.fif';
> cfg.bpfilter  = 'yes';
> cfg.bpfreq    = [a b];
> data = ft_preprocessing(cfg);
> 
> 2. Define trial.
> cfg   =  ft_definetrial(cfg);
>   
> 3. Preprocessing step for epoching data on filtered data.
> final_data = ft_preprocessing(cfg,data);
> 
> 
> Thank you for your help.
> Matt
> 
> _______________________________________________
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> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip

Jan-Mathijs Schoffelen, MD PhD 

Donders Institute for Brain, Cognition and Behaviour, 
Centre for Cognitive Neuroimaging,
Radboud University Nijmegen, The Netherlands

Max Planck Institute for Psycholinguistics,
Nijmegen, The Netherlands

J.Schoffelen at donders.ru.nl
Telephone: +31-24-3614793

http://www.hettaligebrein.nl

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