[FieldTrip] Question about cluster based permutation testing in ECOG data

[Eelke Spaak]

Hi Sandra,

In case you want to create an FT-style 'freq' structure, you should
specify the exact frequencies (in Hz) that are present in the
freq.freq field. So freq.freq = [1 2 3...] etc. whereas right now you
have freq.freq = 'all'. I'm not sure this is the only issue here, but
it's at least one to fix :) In case errors persist, it would be
helpful to additionally post the exact error message on the list.

The all-ones cumtapcnt (size ntrial X nfreq) field should be fine, by
the way. When multiple tapers are used per frequency, this field is
used to keep track of which entries along a 'rpttap' dimension (which
represents taperXobservation) belong to which observation. In your
(wavelet) case, I'm assuming you only have a single taper per
frequency, thus the all-ones cumtapcnt should be fine.

Cheers,
Eelke

On Thu, 21 Mar 2019 at 22:25, Gattas, Sandra <gattass at uci.edu> wrote:
>
> Hello,
>
> My goal is to examine which range of frequencies and time from a spectrogram significantly differ between two conditions. More specifically, I want to run the cluster based permutation testing on observations of spectrograms between two conditions.
>
> In order to do so, I am using the ft_freqstatistics.m function in fieldtrip. Although I do not use Fieldtrip for my time-Frequencey analysis - I organized the data in fieldtrip format. The function errors out due to inaccurate dimensions of frequencies and observation numbers. After probing the function, it seems that this information is achieved from the ____.cumtapcnt variable. I used wavelet analysis for frequency decomposition and it is not clear to me how define this variable.
>
> I attached an image of how I set up all my variables for each of the conditions as well as the cfg definitions. Any suggestion on how to trouble shoot this would be much appreciated.
>
>
>
> Thank you,
> Sandra
>
>
> Sandra Gattas
> MD-PhD Candidate
> UC Irvine School of Medicine
> Medical Scientist Training Program
> gattass at uci.edu
> 831-917-0051
>
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