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Related Experiment Videos

Stimulus-dependent BOLD and perfusion dynamics in human V1.

R D Hoge1, J Atkinson, B Gill

  • 1McConnell Brain Imaging Centre, Montreal Neurological Institute, McGill University, Montreal, Quebec H3A 2B4, Canada.

Neuroimage
|May 21, 1999
PubMed
Summary

Blood oxygenation-dependent (BOLD) fMRI signals show over/undershoot due to perfusion changes. This study reveals BOLD overshoot is linked to transient perfusion signals, not just steady-state responses, in the human visual cortex.

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Area of Science:

  • Neuroimaging
  • Functional Magnetic Resonance Imaging (fMRI)
  • Visual Neuroscience

Background:

  • Blood oxygenation-level dependent (BOLD) signals in fMRI often display overshoot or undershoot when stimulation changes.
  • Existing models attribute this to delayed perfusion-related responses (e.g., blood volume, oxygen consumption) lagging behind blood flow adjustments.

Purpose of the Study:

  • To investigate the relationship between BOLD signal transients and steady-state perfusion changes.
  • To determine if BOLD overshoot is stimulus-independent and correlated with steady-state perfusion increases.

Main Methods:

  • Simultaneous recording of BOLD and relative perfusion signals in the primary visual cortex (V1).
  • Induction of graded perfusion increases using three distinct visual stimuli (chromatic, high spatial frequency grating, radial checkerboard).

Related Experiment Videos

  • Control of mean luminance and adjustment of stimulus contrast to equalize steady-state blood flow increases.

    • Main Results:

    • Radial checkerboard stimuli induced significant BOLD and perfusion overshoot/undershoot, unlike chromatic or high spatial frequency stimuli.
    • Transient amplitudes remained relatively constant despite variations in steady-state responses.
    • Demonstrated nonlinear BOLD and perfusion step responses in human V1.

    Conclusions:

    • BOLD overshoot/undershoot are not solely dependent on steady-state perfusion but are linked to transient perfusion signal features.
    • Slowly changing blood volume dynamics may amplify these transient perfusion effects on BOLD signals.
    • Findings challenge purely tissue-specific explanations for BOLD overshoot and undershoot.