[FieldTrip] Compute Time-Frequency Granger Causality with ft_connectivityanalysis
Hähnke, Daniel
daniel.haehnke at tum.de
Mon Aug 8 11:51:08 CEST 2016
Dear Laetitia,
I think I had this issue before and it was caused by a bug in the fieldtrip version I was using. What version are you using?
Best,
Daniel
--
Daniel Hähnke
PhD student
Technische Universität München
Institute of Neuroscience
Translational NeuroCognition Laboratory
Biedersteiner Straße 29, Bau 601
80802 Munich
Germany
Email: daniel.haehnke at tum.de<mailto:daniel.haehnke at tum.de>
Phone: +49 89 4140 3356
On 08.08.2016, at 11:36, laetitia.lalla at inserm.fr<mailto:laetitia.lalla at inserm.fr> wrote:
Hello fieldtrippers,
first of all, thanks a lot for this collaborative mailing list. It helped me a lot in the past and i hope you will be able to help me today !
I succesfully implemented the spectral granger causality thanks to this FieldTrip tutorial : http://www.fieldtriptoolbox.org/tutorial/connectivityextended. Now I'd like to compute a Time-Frequency Map of my granger causality. Hence, I used ft_freqanalysis with cfg.method = 'mtmconvol' and cfg.output = 'powandcsd' and the minimal code
>cfg=[];
>cfg.method='granger';
>granger=ft_connectivityanalysis(cfg, freq);
to compute the granger causality.
However, when I run this code, Matlab bugs and stays "busy" for a while until I terminate it, with the following error message :
Operation terminated by user during ft_checkdata>fixcsd (line 1255)
In ft_checkdata (line 797)
data = fixcsd(data, cmbrepresentation, channelcmb);
In ft_checkdata>fixcsd (line 1351)
data = ft_checkdata(data, 'cmbrepresentation', 'full');
In ft_checkdata (line 797)
data = fixcsd(data, cmbrepresentation, channelcmb);
In ft_connectivityanalysis (line 392)
data = ft_checkdata(data, 'cmbrepresentation', 'full');
I can see in the help of the function checkdata the following : "cmbrepresentation = sparse, full (applies to covariance and cross-spectral density)". But I don't really understand what "cmbrepresentation" do ... Maybe someone who had a similar problem in the past can help me ? I think I'm missing some optional arguments that I should add.
Thanks a lot for your help.
Regards,
Laetitia Lalla
PhD student in INMED, Marseille, France
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