[FieldTrip] baseline normalizing

[Tzvetan Popov]

Dear Mubeen,
The function you intend to use requires time dimension. What you provide is only power spectrum. 
You could use https://www.fieldtriptoolbox.org/reference/ft_preproc_standardize/ prior to your freqanalysis if standardized z-scores is what you need. 

Good luck,
Tzvetan


> Am 3/28/21 um 07:16 schrieb mubeen afzal <mubafzal at hotmail.com>:
> 
> 
> Hi all,
> In brainstorm there is option of baseline normalizing (zscore or db or other methods) the timeseries epochs/trials of interest before frequency analysis allowing visual comparisons and further frequency analysis of the normalized epochs
> The normalization function function [freq] = ft_freqbaseline(cfg, freq) doesnt allow normalizing a freq output dimord structure with chan_freq derived using 'mtmfft' method
> I get this error message - 
> 
> "the call to "ft_freqanalysis" took 1 seconds
> the input is freq data with 21 channels, 191 frequencybins and no timebins
> Error using ft_freqbaseline (line 146)
> unsupported data dimensions: chan_freq"
> 
> Is there a way around this?
> 
> Thanks all.
> 
> Mubeen
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> https://doi.org/10.1371/journal.pcbi.1002202
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