[FieldTrip] Beamforming analysis in frequency band
Noa Hertz
noahertz6 at gmail.com
Sun Apr 19 12:57:46 CEST 2015
Thank you Tzvetan!
This raised two more question regarding the source analysis:
1. What is the difference between defining the frequency range under
cfg.foi (such as cfg.foi=[30 48]) and defining if under the cfg.tapsmofrq
(such as cfg.foi=[39 39] cfg.tapsmofrq=9)?
2. the cfg.tapsmofrq option only exist in the ft_freqanalysis function, and
not in the ft_sourceanalysis function. in ft_sourceanalysis the only
option is cfg.frequency which, as I mention, has to be a scalar. My
question is whether defining the cfg.tapsmofrq in the ft_freqanalysis is
also causing the source analysis to use the range of frequencies and not
the single frequency.
*Thanks a lot,*
*Noa*
2015-04-16 14:53 GMT+03:00 Tzvetan Popov <tzvetan.popov at uni-konstanz.de>:
>
> 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);
>
>
> --
> My signature:
>
> http://www.documentarywire.com/earthlings/
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>
>
>
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>
--
מעכשיו זאת החתימה שלי.. חובה לראות
http://www.documentarywire.com/earthlings/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20150419/f6b5f60e/attachment-0002.html>
More information about the fieldtrip
mailing list