Characterization of the hemodynamic response function in default mode network subregions for task-evoked negative BOLD responses
bioRxiv September 19, 2025 Hengda He, B. G. Yazdi, Amir Sedaghat et al. preprint
While the hemodynamic response function (HRF) of the positive blood oxygenated level dependent (BOLD) signal is well characterized in the functional magnetic resonance imaging (fMRI) field, studies investigating the shape and properties of the negative BOLD HRF, often observed in the default mode network (DMN) regions, are rare. In this study, we first investigated the linearity of the...