[FieldTrip] Beamforming analysis in frequency band

[Tzvetan Popov]

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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> 
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