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Spatial relationship between neuronal activity and BOLD functional MRI.

Dae-Shik Kim1, Itamar Ronen, Cheryl Olman

  • 1Center for Magnetic Resonance Research, University of Minnesota Medical School, Minneapolis, MN 55455, USA. dskim@bu.edu

Neuroimage
|March 10, 2004
PubMed
Summary
This summary is machine-generated.

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Functional magnetic resonance imaging (fMRI) BOLD signals reliably predict neuronal activity at millimeter scales. However, correlations vary at finer scales, indicating BOLD is best for supra-millimeter neuronal activity prediction.

Area of Science:

  • Neuroscience
  • Neuroimaging

Background:

  • Functional magnetic resonance imaging (fMRI) is widely used.
  • The relationship between fMRI signals and neuronal activity is not fully understood.

Purpose of the Study:

  • To investigate the correlation between neuronal activity and blood oxygenation level-dependent (BOLD) fMRI signals.
  • To determine the spatial scales at which BOLD signals accurately reflect neuronal activity.

Main Methods:

  • Direct comparison of single and multiunit neuronal recordings with BOLD fMRI responses.
  • Experiments conducted in cat area 18.

Main Results:

  • BOLD contrast showed a linear correlation with neuronal activity at the millimeter scale.
  • Correlation between BOLD and neuronal signals varied significantly at the individual electrode recording site level.

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Conclusions:

  • T(2)*-based positive BOLD signals are reliable predictors of neuronal activity.
  • This reliability is limited to supra-millimeter spatial scales.