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[Neuroscience] Number of independent components

Laura Palacio via neur-sci%40net.bio.net (by laurapalacio94 from gmail.com)
Wed Apr 13 04:07:41 EST 2016


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,

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