[FieldTrip] ft_freqanalysis using wavelets, problems with trialdef
dominic.depke at rub.de
Wed Jun 18 15:58:25 CEST 2014
Actually I am analyzing EEG data containing epileptic seizure-like
activity in Fieldtrip.
Data is read in continuous mode and segments of interest are visually
identified using the databrowser and a trial-structure (cfg.trl) is made
from the information in the 'cfg.artfctdef.visual.artifact' field.
After the trial-definition ft_preprocessing is called a second time with
the option 'cfg.continuous' set to 'no'.
Now I tried to use ft_frequanalysis using wavelets to get information
about power-spectral densities for every single trial and every single
channel ( in terms of individual 'seizure' events) but the output
structure is filled with NaNs.
I read the tutorial documentations and changed the values for cfg.toi
and width but the result remained the same.
Further, my datastructure does not contain a .trialinfo field so how
should the trialdefinition look like (e.g. if you create cfg.trials)
for use with ft_freqanalysis?
There is only a cfg.trl and a data.trial field in the datastructure.
Moreover, my data does not contain any stimulus codes.
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