Figure 7.

An example of the HRFs recovered using the reference model, pulse and respiration RETROICOR model and by single-regressor HbO (figure 7a) and HbR (figure 7b) models for a single subject, run and NIRS channel for voxels well correlated each NIRS regressor ( $0.2<{\text{R}}_{\text{base}}^2<0.3$). The true, single-gamma HRF is also shown in both figures.