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Related Experiment Videos

The variability of human, BOLD hemodynamic responses

G K Aguirre1, E Zarahn, M D'esposito

  • 1Department of Neurology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, 19104-4283, USA.

Neuroimage
|November 13, 1998
PubMed
Summary

Cerebral hemodynamic responses show significant variability across individuals but are more consistent within a single subject during functional magnetic resonance imaging (fMRI) scans. This finding impacts the analysis of event-related fMRI designs.

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Area of Science:

  • Neuroimaging
  • Cognitive Neuroscience
  • Physiology

Background:

  • Cerebral hemodynamic responses, crucial for blood oxygenation level-dependent (BOLD) functional magnetic resonance imaging (fMRI), are known to be time-delayed and dispersed.
  • Understanding the precise shape and variability of these responses is essential for accurate fMRI experimental design and data analysis.

Purpose of the Study:

  • To investigate the characteristics and variability of hemodynamic responses originating from the central sulcus in human subjects.
  • To quantify the contributions of individual subjects, experimental days, and scanning sessions to the variability observed in evoked hemodynamic response shapes.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to scan human subjects.
  • An event-related, simple reaction time task was utilized to elicit neural activity.

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  • Hemodynamic responses were measured from the central sulcus.

    • Main Results:

    • Significant and substantial variability in the shape of hemodynamic responses was observed across different subjects.
    • Hemodynamic responses recorded during multiple scans within the same subject exhibited considerably less variability.
    • Subject-specific consistency in hemodynamic response shape was a notable finding.

    Conclusions:

    • The variability of cerebral hemodynamic responses has direct implications for the sensitivity and specificity of event-related fMRI analyses.
    • Accounting for subject-specific response characteristics may enhance the reliability of fMRI study findings.
    • Further research into the sources of hemodynamic response variability is warranted for optimizing fMRI methodologies.