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  Investigating the wavelet coherence phase of the BOLD signal

Müller, K., Lohmann, G., Neumann, J., Grigutsch, M., Mildner, T., & von Cramon, D. Y. (2004). Investigating the wavelet coherence phase of the BOLD signal. Journal of Magnetic Resonance Imaging, 20(1), 145-152. doi:10.1002/jmri.20064.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-BF9D-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-D886-1
Genre: Journal Article

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 Creators:
Müller, Karsten1, Author              
Lohmann, Gabriele1, Author              
Neumann, Jane1, Author              
Grigutsch, Maren2, Author              
Mildner, Toralf3, Author              
von Cramon, D. Yves1, Author              
Affiliations:
1Department Cognitive Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634563              
2Department Neuropsychology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634551              
3Methods and Development Unit Nuclear Magnetic Resonance, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634558              

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Free keywords: functional magnetic resonance imaging; fMRI; wavelet coherence phase; wavelet analysis; coherence; phase shift
 Abstract: Purpose: To investigate the temporal behavior of the blood oxygenation-level dependent (BOLD) signal applying the wavelet coherence phase to functional magnetic resonance imaging (fMRI) data. Materials and Methods: The wavelet coherence phase was computed for a group of four subjects using three functional runs of different visual stimulation lengths. In order to consider the variability of the wavelet coherence phase, a correlation analysis was performed between the variance of the phase shift and the associated activation strength. In activated brain regions, correlation was performed between the mean wavelet coherence phase and the spectral density phase shift. Results: The scalograms of the wavelet coherence phase show the temporal variability of the phase shift between fMRI time series. For brain regions with weakly stationary behavior, the mean wavelet coherence phase supports the results obtained by spectral analyses. Conclusion: The wavelet coherence phase provides a description of the temporal behavior of the BOLD signal even for the nonstationary case. In particular, temporal changes of the phase shift can be investigated. This makes the wavelet coherence phase more suitable for the investigation of BOLD dynamics than an average phase lag obtained by correlation or spectral methods.

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Language(s): eng - English
 Dates: 2004
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 239111
DOI: 10.1002/jmri.20064
Other: P6663
 Degree: -

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Title: Journal of Magnetic Resonance Imaging
Source Genre: Journal
 Creator(s):
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Publ. Info: Chicago, IL : Society for Magnetic Resonance Imaging
Pages: - Volume / Issue: 20 (1) Sequence Number: - Start / End Page: 145 - 152 Identifier: ISSN: 1053-1807
CoNE: /journals/resource/954925594512