[FieldTrip] read_biosig_header.m

["Jörn M. Horschig"]

Dear Steve,

Although I cannot help you directly and do not know about the specific 
error you got, you can find all code changes on 
http://code.google.com/p/fieldtrip/

For the biosig file you are referring to, please look here:
http://code.google.com/p/fieldtrip/source/diff?path=/trunk/fileio/private/read_biosig_header.m&format=side&r=5429
(but as you can see, nothing changed there)

Hope someone else can help out (Robert is on vacation right now, so 
maybe someone else can help)

Best,
Jörn

On 7/10/2012 8:49 PM, Steve Deiss wrote:
> The fieldtrip version we have calls function 'read_biosig_header' 
> which calls 'sopen' with the following sequence.
>      biosig = sopen(filename,'r');
> For some reason it loses the digital triggers on channel 1 in our data 
> after issuing the following warning:
>
> "Reading data file header...
> WARNING SOPEN(EDF): Physical Max/Min values of EDF data are not 
> necessarily defining the dynamic range.
>    Hence, OVERFLOWDETECTION might not work correctly. See also 
> EEG2HIST and read
>    http://dx.doi.org/10.1016/S1388-2457(99)00172-8 (A. Schlgl et al. 
> Quality Control ... Clin. Neurophysiol. 1999, Dec; 110(12): 2165 - 2170).
>    A copy is available here, too: 
> http://www.dpmi.tugraz.at/schloegl/publications/neurophys1999_2165.pdf "
>
> If we let EEGLAB read the data, its function 'pop_biosig' calls 
> 'sopen' with
>      biosig = sopen(filename,'r',0,'OVERFLOWDETECTION:OFF');
> The data read in here includes the triggers so that we can go on to 
> epoch and process the data.
>
> We are not yet ready to upgrade to the very latest fieldtrip.  So I 
> would like to know if there is an easy way to
> determine if the latest version of fieldtrip changed anything in the 
> way sopen is called from read_biosig_header?
> If it matches what EEGLAB does here, we can match that as a temporary 
> fix.
>
> I'll try to download and unpack it to see, but if this is a known 
> problem, fixed or not, I'd appreciate any tips.
>
> Thanks
> Steve
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
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-- 
Jörn M. Horschig
PhD Student
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen
Neuronal Oscillations Group

P.O. Box 9101
NL-6500 HB Nijmegen
The Netherlands

Contact:
E-Mail: jm.horschig at donders.ru.nl
Tel:    +31-(0)24-36-68493
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