Table 2.

Estimated CMRO₂ responses and CBF/CMRO₂ coupling ratios (n) for different stimulus contrast levels (mean ± standard deviation for 9 healthy subjects), for two assumptions of the model parameters in Eq [1].

	α =0.4, β =1.5		α =0.14, β =0.9
Contrast	CMRO2 response (%)	n (dimensionless)	CMRO2 response (%)	n (dimensionless)
Level 1 (11 cd/m2)	13.8 ± 6.9d	1.75 ± 0.25c,d	15.2 ± 7.7d	1.63 ± 0.34c,d
Level 2 (52 cd/m2)	18.3 ± 8.7	2.08 ± 0.53	19.3 ± 10.0	2.15 ± 0.99
Level 3 (94 cd/m2)	18.1 ± 5.4d	2.21 ± 0.36a	18.3 ± 6.1	2.25 ± 0.64 a
Level 4 (1036 cd/m2)	24.0 ± 6.9a,c	2.3 (assumed)	24.0 ± 6.9a	2.3 (assumed)

^asignificant difference with contrast 1 with p < 0.05

^bsignificant difference with contrast 2 with p < 0.05

^csignificant difference with contrast 3 with p < 0.05

^dsignificant difference with contrast 4 with p < 0.05