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Bold haemodynamic response chart Illustration and Icon
Bold haemodynamic response chart
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A line graph illustrates the blood-oxygen-level-dependent (BOLD) hemodynamic response function (HRF), showing a brief initial dip, a prominent peak, and a slow decay with a post-stimulus undershoot. In the biological hierarchy, it represents microvascular and hemoglobin oxygenation changes within cortical tissue of the brain, an organ of the central nervous system. In neuroimaging and physiology, this time-series signal underlies functional MRI (fMRI) mapping of neural activity, enabling localization of task-evoked responses in the cerebral cortex.
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