Table 3.

Three-way ANOVA results ($F$ values) for mean signal change.

	No stimulus		Speech
	Oxy-Hb	Deoxy-Hb	Oxy-Hb	Deoxy-Hb
(A) S-D distance (2, 148)	2.4	3.6	24.9***	12.7***
(B) Hemisphere (1, 148)	0.1	0.9	0.8	0.9
(C) Layer (2, 148)	0.4	1.1	18.7***	8.7***
$\mathrm{A}\times \mathrm{B}$ (2, 148)	1.2	0.2	0.1	0.2
$\mathrm{A}\times \mathrm{C}$ (4, 148)	0.3	0.6	5.8***	2.6
$\mathrm{B}\times \mathrm{C}$ (2, 148)	0.0	0.3	0.1	0.7

The numbers in parentheses in the first column indicate the degrees of freedom for each factor and interaction. Triple (***) asterisks denote statistical significance at $p<0.0005$.