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Schematic for the generation of fMRI and fMRE task regressors. (a) The fMRI task regressor is a boxcar function (corresponding to the task ON and OFF blocks) convolved with a canonical hemodynamic response function (HRF). (b & c) The fMRE task regressors for a first-order exponential decay model and gamma-variate model is a boxcar function convolved with an exponential viscoelastic response function (VRF) and a gamma-variate VRF, respectively.
