[FieldTrip] Beamforming analysis in frequency band
Tzvetan Popov
tzvetan.popov at uni-konstanz.de
Thu Apr 16 13:53:41 CEST 2015
Dear Noa,
you should use frequency smoothening to achieve this. For example, a configuration of cfg.foilim = [20 20] ; and cfg.tapsmofrq = 10; will allow you to estimate sources in the 10 to 30 Hz band.
> Hi all,
>
> I'm doing source analysis in the frequency domain of a resting-state data.
> when doing the source analysis, I want to use several frequency bands of interest, such as beta (13-30 Hz) and gamma (30-48 Hz).
> My problem is about the cfg.frequency parameter, which must be a scalar (whereas i'm interested in a frequency band). Arbitrarily choosing a frequency in the middle of the range doesn't seem right.
>
> What is the common practice when doing source analysis using this function?
You could evaluate this tutorial:
http://www.fieldtriptoolbox.org/tutorial/beamformer
> Does the cfg.tapsmofrq parameter is supposed to enable choosing frequency band instead of a single peak frequency?
and some detailed explanation in a pictorial form here:
https://www.youtube.com/watch?v=7eS11DtbIPw
best
tzvetan
>
> Any suggestions will be very much helpful!
>
> Thanks,
> Noa
>
>
> This is the script I’m using:
>
> cfg = [];
> cfg.method ='mtmfft';
> cfg.output ='fourier';
> cfg.keeptapers = 'yes';
> cfg.foilim = [30 48];
> cfg.tapsmofrq = 2;
> freqClosed=ft_freqanalysis(cfg,eyesClosed);
>
>
>
> cfg = [];
> cfg.method='pcc';
> cfg.frequency = 39; % must be a scalar
> cfg.lambda = 0;
> cfg.vol = vol;
> cfg.grid = grid;
> cfg.feedback = 'textbar';
> cfg.keepfilter='yes';
> source1 = ft_sourceanalysis(cfg, freqClosed);
>
>
> --
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>
> http://www.documentarywire.com/earthlings/
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