denoise_synthetic

Michael Wibral michael.wibral at WEB.DE
Thu Jul 17 17:16:26 CEST 2008


Dear Robert,

I have a question regarding the use of the new preprocessing function and denoise synthetic:
If the ctf data are saved in 3rd gradient mode - will preprocessing and denoise_synthetic treat this correctly? I.e. will these functions not perform any (unnecessary/wrong) computation and simply update the relevant information fields in the data structure? Or do I have to save the ctf data in raw format and then let fieldtrip do the rest?
Sorry if this question is somehow redundant. Just wanted to be sure.

Many thanks,
Michael

> -----Urspr√ľngliche Nachricht-----
> Von: "Robert Oostenveld" <r.oostenveld at FCDONDERS.RU.NL>
> Gesendet: 17.07.08 17:07:06
> An: FIELDTRIP at NIC.SURFNET.NL
> Betreff: [FIELDTRIP] denoise_synthetic


> Dear all,
> 
> I just noticed that it was possible to do denoise_synthetic (i.e.  
> apply 3rd order gradients to CTF data) without all required channels  
> being present in the data. It requires the MEG channels and the  
> reference channels to be both present in the preprocessed data.
> 
> If you have beein doing cfg.channel=MEG in preprocessing and then  
> denoise_synthetic, then the data will not be correct 3rd order  
> gradients. If you have been doing cfg.channel=all, then  
> denoise_synthetic will have done its job correct (I hope). I have now  
> added an explicit check on the presence of the required channels, so  
> now it will give an error if the reference channels are missing.
> 
> best regards,
> Robert
> 
> PS the update will be available this evening on the ftp
> 
>   
> 
> ----------------------------------
> 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/fcdonders/fieldtrip.
> 



----------------------------------
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/fcdonders/fieldtrip.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Michael Wibral.vcf
Type: text/x-vcard
Size: 443 bytes
Desc: not available
URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20080717/6cfd668f/attachment-0002.vcf>


More information about the fieldtrip mailing list