Temporal stability of the hemodynamic response function across the majority of human cerebral cortex.

ABSTRACT: The hemodynamic response function (HRF) measured with functional magnetic resonance imaging is generated by vascular and metabolic responses evoked by brief (<4 s) stimuli. It is known that the human HRF varies across cortex, between subjects, with stimulus paradigms, and even between different measurements in the same cortical location. However, our results demonstrate that strong HRFs are remarkably repeatable across sessions separated by time intervals up to 3 months. In this study, a multisensory stimulus was used to activate and measure the HRF across the majority of cortex (>70%, with lesser reliability observed in some areas of prefrontal cortex). HRFs were measured with high spatial resolution (2-mm voxels) in central gray matter to minimize variations caused by partial-volume effe

SUBMITTER: Taylor AJ 

PROVIDER: S-EPMC9582369 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature