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Laminar-specific functional connectivity mapping with multi-slice line-scanning fMRI.

Sangcheon Choi1,2, Hang Zeng1,2, Yi Chen1

  • 1Department of High-field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Tübingen 72076, Germany.

Cerebral Cortex (New York, N.Y. : 1991)
|February 2, 2022
PubMed
Summary
This summary is machine-generated.

This study reveals brain state-dependent laminar functional magnetic resonance imaging (fMRI) signals. High-resolution fMRI mapping shows distinct information flow patterns in different brain states and conditions.

Keywords:
BOLDcortical layerfunctional connectivitylaminar fMRIresting-state fMRI

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Area of Science:

  • Neuroscience
  • Brain Imaging
  • Systems Neuroscience

Background:

  • Laminar functional magnetic resonance imaging (fMRI) signals are crucial for understanding the brain's canonical microcircuit.
  • However, the spatiotemporal dynamics of laminar-specific information flow across cortical regions, especially under different brain states and conditions, require further investigation.

Purpose of the Study:

  • To develop and apply a novel multislice line-scanning fMRI (MS-LS) method for high-resolution laminar fMRI signal detection.
  • To investigate laminar-specific information flow in both evoked and resting-state conditions in anesthetized rats.

Main Methods:

  • Developed a multislice line-scanning fMRI (MS-LS) technique enabling high spatial (50 μm) and temporal (100 ms) resolution.
  • Applied MS-LS to detect laminar blood-oxygen-level-dependent (BOLD) responses in adjacent cortical regions in rats.

Main Results:

  • Detected laminar-specific positive or negative BOLD responses in cortical regions adjacent to the primary activation site.
  • Observed distinct patterns: Layer 4 (L4) correlation for positive BOLD (thalamocortical), and Layer 2/3 (L2/3) correlation for negative BOLD (corticocortical), indicating brain state-dependent responses.
  • Identified low-frequency signal propagation from caudal to rostral slices in resting-state fMRI (rs-fMRI) with lag time differences across L2/3, L4, and L5.

Conclusions:

  • The study introduces a unique laminar fMRI mapping scheme for detailed characterization of intra- and inter-laminar functional connectivity.
  • Findings highlight brain state-dependent laminar fMRI responses and information flow, particularly the role of corticocortical interactions in negative BOLD events.
  • The developed MS-LS method offers a powerful tool for advancing our understanding of neural circuit dynamics at the laminar level.