Table 1.
Summary of the parameters used to simulate the rest HRF. Balloon model parameters were selected based on the values reported in previous literature – ((Mildner et al., 2001) for α τ0, τv, k1, k2, k3) and ((Buxton et al., 2004) for E0, V0).
| Parameters | Values | ||
|---|---|---|---|
| Inflow (a trapezoid) | Ramp time | 0.1 s | |
| Maximum amplitude | 1.05 | ||
| Plateau time | 1 s | ||
| Balloon Model Parameters | α (steady-state flow-volume relation: v = fα) | 0.3~0.6 | |
| τv (a viscosity parameter depicting an additional resistance to rapid volume changes during undershoot) | 25~35 (s) | ||
| τ0 (mean transit time through the venous compartment at rest) | 1.8~2.5 (s) | ||
| E0 (Baseline O2 extraction fraction) | 0.4 | ||
| V0 (Baseline blood volume) | 0.03 | ||
| Dimensionless parameters quantifying the BOLD contributions from different components | k1 | 6.7 | |
| k2 | 2.73 | ||
| k3 | 0.57 | ||