Table II.

Differences between the vascular response and the baseline compared between the three conditions of the Stroop task†

Position	Chromophore	Average difference between response and baseline mean ± S.D. (nM)			Statistical analysis
		Neutral	Congruent	Incongruent	Repeated measuresa	Incongruent vs. congruentb	Incongruent vs. neutralb
F3	Oxy‐Hb	198.4 ± 188	249.6 ± 167	300.1 ± 236	*	NS	**
	Deoxy‐Hb	−64.4 ± 72	−77.3 ± 94	−108.4 ± 79	*	*	*
	Total Hb	134 ± 149	172.3 ± 119	191.7 ± 186	NS	NS	‡
F4	Oxy‐Hb	209.7 ± 248	220.7 ± 176	300.6 ± 259	‡	NS	*
	Deoxy‐Hb	−64.8 ± 109	−80.7 ± 98	−118.9 ± 113	**	*	**
	Total Hb	144.9 ± 167	140.1 ± 96	181.8 ± 204	NS	NS	NS
F7	Oxy‐Hb	−37.6 ± 125	−22.2 ± 137	86.6 ± 134	*	‡	*
	Deoxy‐Hb	−11.2 ± 48	−11.6 ± 56	−4 ± 75	NS	NS	NS
	Total Hb	−48.8 ± 138	−33.8 ± 175	82.6 ± 140	‡	NS	*
F8	Oxy‐Hb	−61.3 ± 173	−27.8 ± 78	85.5 ± 142	*	*	*
	Deoxy‐Hb	−50.8 ± 110	−8.9 ± 43	−17.3 ± 66	NS	NS	NS
	Total Hb	−112.2 ± 255	−36.7 ± 105	68.2 ± 144	*	‡	*
FC3	Oxy‐Hb	151.5 ± 145	233.1 ± 142	272.3 ± 199	**	NS	**
	Deoxy‐Hb	−71.2 ± 55	−83.6 ± 57	−99.4 ± 85	NS	NS	NS
	Total Hb	80.3 ± 133	149.5 ± 128	172.9 ± 151	**	NS	**
FC4	Oxy‐Hb	160.5 ± 181	254.4 ± 94	255.5 ± 162	*	NS	‡
	Deoxy‐Hb	−90.1 ± 63	−102.1 ± 44	−108.6 ± 82	NS	NS	NS
	Total Hb	70.4 ± 164	152.3 ± 103	147 ± 132	*	NS	*

^†Vascular response at 3–8 seconds after the trial. Baseline response 2 seconds before the trial. n = 14. NS, not significant; Hb, hemoglobin.

^aANOVA, df = 2.

^bPaired students t‐test, one‐tailed; df = 13.

^* P < 0.05;

^** P < 0.01;

^‡ P < 0.1 (trend).