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- W3165444043 abstract "Physiological pulsations have been shown to affect the global blood oxygen level dependent (BOLD) signal in human brain. While these pulsations have previously been regarded as noise, recent studies show their potential as biomarkers of brain pathology. We used the extended 5 Hz spectral range of magnetic resonance encephalography (MREG) data to investigate spatial and frequency distributions of physiological BOLD signal sources. Amplitude spectra of the global image signals revealed cardiorespiratory envelope modulation (CREM) peaks, in addition to the previously known very low frequency (VLF) and cardiorespiratory pulsations. We then proceeded to extend the amplitude of low frequency fluctuations (ALFF) method to each of these pulsations. The respiratory pulsations were spatially dominating over most brain structures. The VLF pulsations overcame the respiratory pulsations in frontal and parietal gray matter, whereas cardiac and CREM pulsations had this effect in central cerebrospinal fluid (CSF) spaces and major blood vessels. A quasi-periodic pattern (QPP) analysis showed that the CREM pulsations propagated as waves, with a spatiotemporal pattern differing from that of respiratory pulsations, indicating them to be distinct intracranial physiological phenomenon. In conclusion, the respiration has a dominant effect on the global BOLD signal and directly modulates cardiovascular brain pulsations." @default.
- W3165444043 created "2021-06-07" @default.
- W3165444043 creator A5007630677 @default.
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- W3165444043 date "2021-05-26" @default.
- W3165444043 modified "2023-10-18" @default.
- W3165444043 title "Spectral analysis of physiological brain pulsations affecting the <scp>BOLD</scp> signal" @default.
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- W3165444043 doi "https://doi.org/10.1002/hbm.25547" @default.
- W3165444043 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8356994" @default.
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- W3165444043 hasPublicationYear "2021" @default.
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