[FieldTrip] 'db' baseline

Marta Andujar marta.andujar at uniroma1.it
Mon Jan 4 15:01:02 CET 2021

Dear All,

I am performing a TF analysis via wavelet algorithm. I am using a db
baseline normalization. For few trials and only in some channels and
conditions, after this procedure  i get -inf as power value. Raw data do
not contain NaN. Why I get this result? By inspecting the power at single
trial level I could not see any "overnormal" noise in those trials.
A second question concerns the prerocessing: I am applying a butterwoth
bandpass([0.5 1000 Hz]) filter to raw data sampled at 24 KHz. If I set the
filter order to 5, the resulting TF matrix is an m by n NaN matrix. However
this occurs again, only for some channels and conditions. At the moment I
am applying a second order filter to avoid this problem but I would like to
figure out why this occurs.
Many thanks


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