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Related Experiment Video

Updated: Mar 27, 2026

Resting-State Connectivity and Neuroimaging of Prefrontal Cortex Activity During a Block-Design Yoga Asana Practice Using fNIRS
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Arterial CO2 effects modulate dynamic functional connectivity in resting-state fMRI.

F Nikolaou, C Orphanidou, R G Wise

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |January 7, 2016
    PubMed
    Summary

    Physiological noise, specifically carbon dioxide levels, impacts brain connectivity measured by functional MRI (fMRI). Understanding this relationship is crucial for accurate resting-state fMRI analysis.

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    Area of Science:

    • Neuroimaging
    • Physiological monitoring
    • Brain function

    Background:

    • The blood-oxygen-level-dependent (BOLD) signal in functional magnetic resonance imaging (fMRI) is affected by physiological factors like arterial carbon dioxide (CO2).
    • Resting-state functional connectivity studies may be confounded by physiological noise, including spontaneous CO2 fluctuations.
    • The temporal variability of resting functional connectivity (dynamic functional connectivity) has sources that are not fully understood.

    Purpose of the Study:

    • To investigate the relationship between dynamic functional connectivity patterns and end-tidal CO2 (PETCO2) properties.
    • To determine how CO2 fluctuations modulate resting-state functional connectivity.

    Main Methods:

    • Resting-state fMRI data were acquired from 12 healthy subjects.
    • The correlation between PETCO2 and the BOLD signal was analyzed.
    • The influence of this correlation on dynamic functional connectivity was examined.

    Main Results:

    • A modulatory effect of the PETCO2-BOLD signal correlation strength on dynamic resting functional connectivity was demonstrated.
    • The observed effect was highly dependent on the data analysis methodology employed.

    Conclusions:

    • End-tidal CO2 significantly influences dynamic resting functional connectivity.
    • Careful consideration of data analysis methods is essential when interpreting resting-state fMRI findings related to functional connectivity and physiological noise.