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Related Experiment Video

Updated: May 1, 2026

Cerebral Blood Flow-Based Resting State Functional Connectivity of the Human Brain using Optical Diffuse Correlation Spectroscopy
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Functional integration between brain regions at rest occurs in multiple-frequency bands.

Suril R Gohel1, Bharat B Biswal

  • 11 Department of Biomedical Engineering, New Jersey Institute of Technology , Newark, New Jersey.

Brain Connectivity
|April 8, 2014
PubMed
Summary

Resting-state functional connectivity (RSFC) is a multiband phenomenon, occurring across multiple frequency bands beyond the commonly studied low frequencies. This study reveals that brain networks are consistently present across various frequency bands, suggesting broader functional integration.

Keywords:
BOLDICARSFChigh frequencymultiband

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Area of Science:

  • Neuroscience
  • Functional Neuroimaging

Background:

  • Resting-state fMRI (functional Magnetic Resonance Imaging) studies identify temporal correlations in blood oxygen level dependent (BOLD) signals.
  • These correlations are primarily driven by low-frequency fluctuations (0.01-0.1 Hz), categorized into slow-5 and slow-4 bands.
  • Previous fMRI sampling rates limited exploration of other neurophysiologically relevant bands (slow-3, -2, -1).

Purpose of the Study:

  • To investigate resting-state functional connectivity (RSFC) across a wider range of frequency bands (slow-5 to slow-1).
  • To evaluate the impact of different frequency bands on the spatial extent and connectivity strength of known resting-state networks (RSNs).

Main Methods:

  • Utilized resting-state fMRI data from 21 healthy subjects.
  • Acquired data at a higher sampling frequency (1.5 Hz) to enable analysis of faster frequency bands.
  • Derived RSNs using independent component analysis and seed-based correlation analysis.

Main Results:

  • Commonly identified RSNs (default mode, fronto-parietal, dorsal attention, visual) were consistently observed across multiple frequency bands.
  • Significant inter-hemispheric connectivity was detected across all analyzed frequency bands.
  • Spatial extent of seed-based correlation maps decreased in the slower frequency bands (slow-2 and slow-1).

Conclusions:

  • Resting-state functional brain integration occurs across multiple frequency bands, indicating RSFC is a multiband phenomenon.
  • The findings support the need for further research into the role of various BOLD signal frequency bands in cognitive processes.