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

Sebastian Sauppe sauppe.s at gmail.com
Wed Oct 10 09:47:38 CEST 2018


Dear David,

thanks a lot, that clarifies what the different methods do.

— Sebastian

> Am 09.10.2018 um 13:27 schrieb David Schubring <david.schubring at uni-konstanz.de>:
> 
> 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/>
>> Twitter: @SebastianSauppe <https://twitter.com/SebastianSauppe>
>> Google Scholar Citations: https://scholar.google.de/citations?user=wEtciKQAAAAJ <https://scholar.google.de/citations?user=wEtciKQAAAAJ>
>> ResearchGate: http://www.researchgate.net/profile/Sebastian_Sauppe <http://www.researchgate.net/profile/Sebastian_Sauppe>
>> ORCID ID: http://orcid.org/0000-0001-8670-8197 <http://orcid.org/0000-0001-8670-8197>
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>> https://doi.org/10.1371/journal.pcbi.1002202
> 
> -- 
> Dr. David Schubring
> 
> General & Biological Psychology
> University of Konstanz
> Room C524
> P.O. Box 36
> 78457 Konstanz
> 
> Phone: +49-(0)7531-88-5350
> Homepage: https://gpbp.uni-konstanz.de/people-page/david-schubring





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