[FieldTrip] Connectivity analysis with powcorr_ortho

[Matthias Treder]

Yes I tried cfg.keeptrials = 'yes'.

I should add that I just have one long trial (resting state). I chopped it
into 10 seconds-trials  with ft_definetrials and re-did the analysis but it
didn't help either.

As said below, looking into the code the dimensions should be
rpttap_chan_freq but I have rpttap_chan_freq_time because I used wavelets
(as in Hipp's paper).

Any other ideas?


Best,
Matthias





> Message: 1
> Date: Wed, 15 Oct 2014 19:56:17 +0100
> From: Matthias Treder <matthias.treder at gmail.com>
> To: fieldtrip at science.ru.nl
> Subject: [FieldTrip] Connectivity analysis with powcorr_ortho
> Message-ID:
>         <
> CAAQEB5rODY2bTwOkQhPPKMeWQG68hozdOB4qiSn1pBP2W7LyHw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hello FieldTrippers,
>
> I want to do a envelope-based connectivity analysis of resting state MEG
> following the regime of Hipp. The respective method is implemented in
> ft_connectivityanalysis as powcorr_ortho.
>
> Like in the Hipp paper, I am first doing a wavelet analysis on the sensor
> level (10 Hz for me).
> I eventually want to do source-space analysis - currently I stay in sensor
> space, however.
> I keep the complex Fourier coefficients (cfg.output     = 'fourier') and
> the result is:
>
>      label: {204x1 cell}
>            dimord: 'rpttap_chan_freq_time'
>              freq: [10 20]
>              time: [1x57400 double]
>     fourierspctrm: [4-D double]
>         cumtapcnt: [1 1]
>              grad: [1x1 struct]
>               cfg: [1x1 struct]
>
>
> Looking in ft_connectivityanalysis in line 697 the function requires either
> a field .mom or the structure of the data has to be rpttap_chan_freq, but I
> have sensor-level time-frequency data.
>
> Any idea how to fix my analysis?
>
> Thanks a lot !
> Matthias
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> Message: 2
> Date: Wed, 15 Oct 2014 22:09:43 +0200 (CEST)
> From: Fr?d?ric Roux <f.roux at bcbl.eu>
> To: FieldTrip discussion list <fieldtrip at science.ru.nl>
> Subject: Re: [FieldTrip] Connectivity analysis with powcorr_ortho
> Message-ID: <577666873.3492259.1413403783469.JavaMail.root at bcbl.eu>
> Content-Type: text/plain; charset=utf-8
>
> Hi Matthias,
>
> have you tried:
>
> cfg.keetrials = 'yes' in your cfg?
>
> Best,
> Fred
>
> Fr?d?ric Roux
>
> ----- Original Message -----
> From: "Matthias Treder" <matthias.treder at gmail.com>
> To: fieldtrip at science.ru.nl
> Sent: Wednesday, October 15, 2014 8:56:17 PM
> Subject: [FieldTrip] Connectivity analysis with powcorr_ortho
>
>
>
>
>
>
>
> Hello FieldTrippers,
>
>
> I want to do a envelope-based connectivity analysis of resting state MEG
> following the regime of Hipp. The respective method is implemented in
> ft_connectivityanalysis as powcorr_ortho.
>
>
>
> Like in the Hipp paper, I am first doing a wavelet analysis on the sensor
> level (10 Hz for me).
> I eventually want to do source-space analysis - currently I stay in sensor
> space, however.
> I keep the complex Fourier coefficients (cfg.output = 'fourier') and the
> result is:
>
> label: {204x1 cell}
> dimord: 'rpttap_chan_freq_time'
> freq: [10 20]
> time: [1x57400 double]
> fourierspctrm: [4-D double]
> cumtapcnt: [1 1]
> grad: [1x1 struct]
> cfg: [1x1 struct]
>
>
> Looking in ft_connectivityanalysis in line 697 the function requires
> either a field .mom or the structure of the data has to be
> rpttap_chan_freq, but I have sensor-level time-frequency data.
>
> Any idea how to fix my analysis?
>
> Thanks a lot !
> Matthias
>
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>
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