[FieldTrip] ft_denoise_pca and ft_preproc_dftfilter on long trials

[Bruno L. Giordano]

Hello,

I am using the pca/regression method in ft_denoise_pca to get rid of 
reference-channel variance for rather long trials (>5 min).

I am wondering whether these regression methods break down, or don't 
perform as well as they should be, when trials are this long. If yes, is 
there some alternative method I could use that performs better for long 
trials?

I am wondering about trial length also because the regression method for 
line-noise removal in ft_preproc_dftfilter doesn't appear to perform 
well with trials of this length (even though they obviously do wonders 
when I preprocess shorter segments).

Thank you,

	Bruno

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Bruno L. Giordano, PhD
Institute of Neuroscience and Psychology
58 Hillhead Street, University of Glasgow
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