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[Neuroscience] Re: Number of independent components

danieladrechsel from gmail.com via neur-sci%40net.bio.net (by danieladrechsel from gmail.com)
Thu Apr 14 17:58:31 EST 2016


The statistics corner of Stack overflow might  be helpful: http://stats.stackexchange.com 
This seem to be a question about ICA rather than neuroscience anyway.

Best of luck for the thesis!


> On 13 Apr 2016, at 21:32, RSNorman <r_s_norman from comcast.net> wrote:
> 
> On Wed, 13 Apr 2016 11:07:41 +0200, Laura Palacio
> <laurapalacio94 from gmail.com> wrote:
> 
>> Hello,
>> 
>> My name is Laura Palacio and I'm working on my bachelor thesis performing
>> independent component analysis on some fMRI data using MELODIC FSL.
>> 
>> I would like to ask some questions regarding the results of ICA. Usually I
>> obtain about 50 components per subject but this number varies across
>> subjects and after changing some preprocessing steps as well.
>> 
>> For instance, I obtained a larger number of components (ten more than
>> before) after applying intensity normalization and slice timing correction
>> to the data. My question is what does the number of ICs depend on? Why do
>> some patients have more or less components? If they moved less during the
>> scan, does this mean they will have less components or more?
>> 
>> I would really appreciate if someone could help me figure it out. It would
>> be very useful in order to understand the differences between obtaining a
>> larger or smaller number of components from ICA.
>> 
>> Thank you very much,
>> Laura
> 
> I wish you luck with your quest but, sadly, it has been many years
> since there has been a large assortment of neurobiologists here that
> could offer you help.  My own interests in crustacean nervous systems
> doesn't count.
> 
> Anybody?
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