Fig. 4.

Sensitivity of cbf_NIRS-CHS(t) to (a) capillary transit time (t^(c)), (b) venous transit time (t^(v)), and (c) the arterial baseline cerebral blood volume ratio $\frac{{{\text{CBV}}_0}^{(a)}}{{\text{CBV}}_0}.$ For each panel, three conditions are illustrated left to right for the relative arterial-to-venous blood volume dynamics: arterial only ($\Delta {\text{CBV}}^{(v)}(t)=0$), equally venous and arterial ($\Delta {\text{CBV}}^{(a)}(t)=\Delta {\text{CBV}}^{(v)}(t)$), and venous only ($\Delta {\text{CBV}}^{(a)}(t)=0$). The cbf(t) traces indicated by solid lines in the middle plots for (a)-(c) are the same with the cbf(t) trace in Fig. 3(b).