[FieldTrip] What is baseline method "normchange" in ft_freqbaseline?

[David Schubring]

Dear Sebastian,

more information can be found in the code of ft_freqbaseline, where 
"data" is your poststimulus and "meanVals" is your baseline and 
normchange does the following:

data = (data - meanVals) ./ (data + meanVals)

Hope that helps.

Best,
David

PS: The other baseline types do the following:

if (strcmp(baselinetype, 'absolute'))
   data = data - meanVals;
elseif (strcmp(baselinetype, 'relative'))
   data = data ./ meanVals;
elseif (strcmp(baselinetype, 'relchange'))
   data = (data - meanVals) ./ meanVals;
elseif (strcmp(baselinetype, 'normchange')) || (strcmp(baselinetype, 
'vssum'))
   data = (data - meanVals) ./ (data + meanVals);
elseif (strcmp(baselinetype, 'db'))
   data = 10*log10(data ./ meanVals);


Am 09.10.2018 um 11:49 schrieb Sebastian Sauppe:
> Dear list members,
> 
> there are several options for baselining in ft_freqbaseline. Most of them relatively intuitively to understand, like „absolute“ or „db“. However, I wasn’t able to find out what „normchange“ does. Does anyone of you know (where to find information about this)?
> 
> Thanks a lot!
> — Sebastian
> 
> -----------
> Dr. Sebastian Sauppe
> Department of Comparative Linguistics, University of Zurich
> Homepage: https://sites.google.com/site/sauppes/ <https://sites.google.com/site/sauppes/>
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> 
> 
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-- 
Dr. David Schubring

General & Biological Psychology
University of Konstanz
Room C524
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78457 Konstanz

Phone: +49-(0)7531-88-5350
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