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abstract: 'A variety of resting state neuroimaging data tend to exhibit fractal behavior where its power spectrum follows power-law scaling. Resting state functional connectivity is significantly influenced by fractal behavior which may not directly originate from neuronal population activities of the brain. To describe the fractal behavior, we adopted the fractionally integrated process (FIP) model instead of the fractional Gaussian noise (FGN) since the FIP model covers more general aspects of fractality than the FGN model. We also introduce a novel concept called the nonfractal connectivity which is defined as the correlation of short memory independent of fractal behavior, and compared it with the fractal connectivity which is an asymptotic wavelet correlation. We propose several wavelet-based estimators of fractal connectivity and nonfractal connectivity for a multivariate fractionally integrated noise (mFIN). The performance of these estimators was evaluated through simulation studies and the analyses of resting state functional MRI data of the rat brain.'
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confdates: 10-15 June 2012
conference: 2012 International Joint Conference on Neural Networks
confloc: 'Brisbane, Australia'
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creators_id:
- you@ovgu.de
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- ~
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creators_name:
- family: You
given: Wonsang
honourific: ''
lineage: ''
- family: Achard
given: Sophie
honourific: ''
lineage: ''
- family: Stadler
given: Jörg
honourific: ''
lineage: ''
- family: Brückner
given: Bernd
honourific: ''
lineage: ''
- family: Seiffert
given: Udo
honourific: ''
lineage: ''
date: 2012-06
date_type: published
datestamp: 2012-11-09 19:46:49
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dir: disk0/00/00/84/66
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eprint_status: archive
eprintid: 8466
fileinfo: /style/images/fileicons/application_pdf.png;/8466/1/you2012ijcnn.pdf
full_text_status: public
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keywords: 'resting state functional connectivity, fMRI, nonfractal connectivity, fractal, long memory, fractionally integrated process '
lastmod: 2012-11-09 19:46:49
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pagerange: 1-8
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relation_type: []
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reportno: ~
rev_number: 12
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status_changed: 2012-11-09 19:46:49
subjects:
- bio-phys
- brain-img
- comp-neuro-sci
- comp-sci-stat-model
succeeds: ~
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thesistype: ~
title: Fractal analysis of resting state functional connectivity of the brain
type: confpaper
userid: 17667
volume: ~