[FieldTrip] tfa produces zeros

[Marcus Heldmann]

Dear all,
I have a dataset with surface and local field potential recordings and I’d like to perform a tfa. The data are recorded with a BrainVision Recorder, 1KHz sampling frequency, bp 0.05-200Hz. After epoching (-1 to 2 s), filtering (bsfilter 49:51, lpfilter 70) and baseline correction I tried to perform a tfa using a wavelet analysis described in the tutorial (http://fieldtrip.fcdonders.nl/tutorial/timefrequencyanalysis, Time-frequency analysis IV). However, the powspctrm-field just contains NaNs (which is ok) and zeros (not ok). The data seem to be correct, I am able to plot single trials. The strange thing is, that my EEGLAB analysis provides some meaningful results. You can fined the preprocessed data for one condition under the following link

https://drive.google.com/file/d/0B4-NxS-suG8dOXZnVHcxUDFyYXM/view?usp=sharing

Any idea, why this happen’s?

Greetings, Marcus

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Dr. Marcus Heldmann
Klinik für Neurologie
UKSH, Campus Lübeck
Paul-Ehrlich-Strasse 1-3, MGZ
23562 Lübeck
0451 317 9313 14