[FieldTrip] question about artifact rejection

["Jörn M. Horschig"]

Dear Mahdi,

In FieldTrip, you can either reject a trial or a channel completely for 
your whole dataset. If you want to reject individual channels for single 
trials, you have to do it manually. I would not recommend it, though, 
because it will lead to inconsistencies and thus errors throughout the 
rest of your analyses, e.g. for freqanalysis it is necessary to have the 
same amount of channels for all trials. You can hack your way through 
this by replacing the corresponding channel with NaNs or zeros, but that 
will also lead to problems and may make your results invalid (depending 
on what you want to do). My advise would be to dismiss the whole trial 
or use ICA to remove certain components (a tutorial can be found on the 
FieldTrip website)

Best,
Jörn

On 3/2/2011 7:35 PM, m m wrote:
> Hi FT users,
>
> I have a question about artifact rejection. Is there any method to 
> reject one channel in one trial and not whole channel of that trial?
>
> Thanks
> Mahdi
>
>
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip


-- 
Jörn M. Horschig
PhD Student
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen

P.O. Box 9101
NL-6500 HB Nijmegen
The Netherlands

Contact:
E-Mail: jm.horschig at donders.ru.nl
Tel:    +31-(0)24-36-68493
Web: http://www.ru.nl/fcdonders

Visiting address:
Trigon, room 2.30
Kapitelweg 29
NL-6525 EN Nijmegen
The Netherlands

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