|
a
e
|
Efficacy of glucose consumption response to excitation |
1 |
|
a
i
|
Efficacy of glucose consumption response to inhibition |
1 |
| τe
|
Time‐constant of the excitatory glucose consumption impulse response. |
1 |
| τi
|
Time‐constant of the inhibitory glucose consumption impulse response |
0.8 |
|
c
|
Steepness of the sigmoid function x |
2.5 |
|
d
|
Position of the threshold of the sigmoid function x |
1.6 |
| δe
|
Delay between excitatory neuronal activity and corresponding glucose consumption. |
0.1 s |
| δi
|
Delay between inhibitory neuronal activity and corresponding glucose consumption. |
0.1 s |
| δf
|
Delay between excitatory neuronal activity and CBF response |
0.2 s |
| γ |
Baseline ratio of excitatory to inhibitory synaptic activity in the voxel |
5 |
| ε |
Efficacy of blood flow response to excitation |
0.6 |
| τs
|
Constant for CBF signal decay |
1.5 (Friston et al., 2000) |
| τf
|
Constant for CBF autoregulatory feedback |
2.4 (Friston et al., 2000) |
| τ0
|
Transit time through the balloon |
1 s (Buxton et al., 2004) |
| α |
Coefficient of the steady state flow‐volume relationship |
0.4 (Buxton et al., 2004) |
| a1
|
Weight for deoxyhemoglobin change |
3.4 (Buxton et al., 2004) |
| a2
|
Weight for blood volume change |
1 (Buxton et al., 2004) |
|
|
Baseline blood volume |
0.02 (Friston et al., 2000) |