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  Investigating the stimulus-dependent temporal dynamics of the BOLD signal using spectral methods

Müller, K., Mildner, T., Lohmann, G., & von Cramon, D. Y. (2003). Investigating the stimulus-dependent temporal dynamics of the BOLD signal using spectral methods. Journal of Magnetic Resonance Imaging, 17(3), 375-382. doi:10.1002/jmri.10268.

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Müller, Karsten1, Author              
Mildner, Toralf1, Author              
Lohmann, Gabriele1, Author              
von Cramon, D. Yves1, Author              
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1MPI of Cognitive Neuroscience (Leipzig, -2003), The Prior Institutes, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634574              

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 Abstract: PURPOSE: To compare several spectral parameters using different durations of visual hemifield stimulation in order to explore the different temporal behavior of the blood oxygenation-level dependent (BOLD) signal in various brain regions. MATERIALS AND METHODS: Spectral methods were applied to three different groups of subjects with visual stimulation lasting 6, 12, and 30 seconds. Furthermore, diffusion weighting was applied in an interleaved way. The core of the data processing was the computation of the spectral density matrix using the multidimensional weighted covariance estimate. Spectral parameters of coherence and phase shift were computed. RESULTS: The correlation between signal changes and phase shifts was dependent on the duration of the visual stimulation. The shorter the duration of visual stimulation, the stronger the correlation between percentage signal change and phase shift. CONCLUSION: The experiments with short and long stimuli differed mainly in the distribution of the activated voxels in the plane of percentage signal change and phase shift. It was revealed that the height of the signal change depends on the phase shift, whereas the diffusion weighting has no influence.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
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 Identifiers: eDoc: 239281
Other: P6780
DOI: 10.1002/jmri.10268
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Title: Journal of Magnetic Resonance Imaging
Source Genre: Journal
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Publ. Info: Chicago, IL : Society for Magnetic Resonance Imaging
Pages: - Volume / Issue: 17 (3) Sequence Number: - Start / End Page: 375 - 382 Identifier: ISSN: 1053-1807
CoNE: https://pure.mpg.de/cone/journals/resource/954925594512