FIGURE 4.

Phase diagrams depicting the ideal trajectories (0 to 4 s) of individual phases using dHRF-based HbO and HbR, Phases 1∼5 represents the initial dip response and Phases 6 and 7 denote the conventional hemodynamics response: (A) Phase 1, 0 < ΔHbR < ΔHbO, ΔCOE < 0 < ΔCBV, (B) Phase 2, 0 < ΔHbO < ΔHbR, 0 < ΔCOE < ΔCBV, (C) Phase 3, ΔHbO < 0 < ΔHbR, 0 < ΔCBV < ΔCOE, (D) Phase 4, ΔHbO < 0 < ΔHbR, ΔCBV < 0 < ΔCOE, (E) Phase 5, ΔHbO < ΔHbR < 0, ΔCBV < 0 < ΔCOE, (F) Phase 6, ΔHbR < ΔHbO < 0, ΔCBV < ΔCOE < 0, (G) Phase 7, ΔHbR < 0 < ΔHbO, ΔCOE < ΔCBV < 0, and (H) Phase 8, ΔHbR < 0 < ΔHbO, ΔCOE < 0 < ΔCBV.