Table 1.

Oxidative metabolism averaged over regions of interest during 10 trials

Subject	Voxels	Hypercapnia			Photic stimulation
	Total 225	BH	FH	M	BS	FS	rCMRO2
1A	23	1.020 ± 0.001	1.169 ± 0.001	0.11 ± 0.01	1.016 ± 0.001	1.35 ± 0.02	1.14 ± 0.01
1B	25	1.009 ± 0.001	1.058 ± 0.008	0.09 ± 0.01	1.014 ± 0.001	1.40 ± 0.05	1.19 ± 0.03
2A	12	1.025 ± 0.001	1.27± 0.05	0.06 ± 0.02	1.021 ± 0.001	1.55 ± 0.07	1.17 ± 0.04
2B	27	1.024 ± 0.002	1.26 ± 0.03	0.08 ± 0.02	1.021 ± 0.001	1.46 ± 0.03	1.16 ± 0.02
3A	32	1.0218 ± 0.007	1.15 ± 0.01	0.12 ± 0.01	1.0204 ± 0.0008	1.38 ± 0.03	1.16 ± 0.02
3B*	28	1.0133 ± 0.0006	1.21 ± 0.01	0.06 ± 0.003	1.019 ± 0.001	1.54 ± 0.04	1.12 ± 0.02
4A	27	1.014 ± 0.002	1.11 ± 0.02	0.06 ± 0.02	1.022 ± 0.002	1.47 ± 0.03	1.16 ± 0.03
4B*	10	1.010 ± 0.002	1.08 ± 0.04	0.06 ± 0.02	1.005 ± 0.001	1.28 ± 0.04	1.18 ± 0.02
5A	21	1.0222 ± 0.0004	1.17 ± 0.02	0.09 ± 0.01	1.016 ± 0.001	1.35 ± 0.04	1.15 ± 0.02
5B	20	1.017 ± 0.001	1.29 ± 0.02	0.053 ± 0.005	1.022 ± 0.002	1.67 ± 0.06	1.13 ± 0.03
Mean ± SE		1.018 ± 0.002	1.18 ± 0.03	0.079 ± 0.007	1.017 ± 0.005	1.45 ± 0.04	1.16 ± 0.01
SD(exp)		0.00572	0.0807	0.02355	0.005421	0.1173	0.02109
SD(sim)		0.00073	0.0107	0.00550	0.000577	0.0273	0.02530
Var ratio		61	57	18	88	18	0.7†

Least squares estimates ± standard errors in primary visual cortex. B_H and F_H, BOLD and CBF hypercapnia divided by baseline; B_S and F_S, BOLD and CBF photic stimulation divided by baseline; M, BOLD sensitivity calibration parameter; rCMR_O2, change in cerebral metabolic rate for oxygen. 

^*Long duration (5 min) stimulus paradigm; not averaged into Fig. 2. 

^†rCMR_O2 is the only estimate without measurable inter-trial variance compared with Monte Carlo simulated measurement noise, SD(sim) (α = 0.7). The remainder have significant variance over measurement noise (P < 0.001; F = 10 at α = 0.001, n₁ = 9, n₂ = 9).