regarding besa format and freq analysis

[Andrea Ostendorf]

Dear Chintan,

 

Depending on what you would like to do with your data - possibly plotting
and statistical evaluation -, you may find the example script on the
Fieldtrip homepage very useful:
http://fieldtrip.fcdonders.nl/example/apply_clusterrandanalysis_on_tfrs_of_p
ower_that_were_computed_with_besa . 

besa2fieldtrip converts the tfc files to a structure similar to the output
of ft_freqanalysis so freqanalysis itself is not needed. The script shows
you how to perform a grand average and how to carry out a statistical test.
(It compares the output of the function clusterrandanalysis with the new
function freqstatistics - you only need the latter.)

As explained in
http://fieldtrip.fcdonders.nl/tutorial/cluster_permutation_freq, which may
also be of interest to you, Fieldtrip offers several methods for addressing
the multiple-comparisons problem. In the script, the method cfg.correctm =
'cluster' is selected. For this, you will currently need some functions from
the Image Processing Toolbox although I understand that in the long run,
Fieldtrip will include some free functions for the benefit of those who do
not have this toolbox. 

Also, for some options the Statistics toolbox may be required.

 

I suppose that you are working with a BESA version prior to the BESA
Research 5.3 that has just been released? The new version 5.3 features a
comfortable direct MATLAB interface so you can transfer directly from BESA
Research to a MATLAB structure - e.g. automatically by batch commands - and
bypass export to and reading from tfc files. 

 

To facilitate Fieldtrip use for BESA users, besa2fieldtrip will soon be
modified to process the new BESA MATLAB structures as well.

On the BESA website (www.besa.de <http://www.besa.de/> , link ‘Download /
MATLAB Scripts’) you can find some easy-to-use sample MATLAB scripts, and
shortly, sample scripts using Fieldtrip for TFC and image statistics will be
added there as well.

 

Hope this helps you

All the best

Andrea

 

 

Dr. Andrea Ostendorf

Research & Development

 

MEGIS Software GmbH

Freihamer Str. 18

82166 Gräfelfing/Germany

HRB München 109956

CEOs: Dr. Michael Scherg, Theodor Scherg

 

 

  _____  

From: FieldTrip discussion list [mailto:FIELDTRIP at NIC.SURFNET.NL] On Behalf
Of shah chintan
Sent: Donnerstag, 4. Februar 2010 17:22
To: FIELDTRIP at NIC.SURFNET.NL
Subject: [FIELDTRIP] regarding besa format and freq analysis

 


Hi everyone,

 

I am relatively new to fieldtrip.  Can you tell me, once u import .tfc file
using besa2fieldtrip. how to process it further and get the analysis data??

 

Best Regards,

 

Chintan

 

  _____  


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The aim of this list is to facilitate the discussion between users of the
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The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.
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