Table 1.

Deep-layer contribution ratio.

S-D distance	Hb type	Left		Right
		($\text{Mean}\pm \mathrm{SD}$)		($\text{Mean}\pm \mathrm{SD}$)
		No stimulus	Speech	No stimulus	Speech
10 mm	Oxy-Hb	$0.26\pm 0.10$	$0.34\pm 0.07$	$0.27\pm 0.07$	$0.28\pm 0.09$
	Deoxy-Hb	$0.21\pm 0.09$	$0.29\pm 0.07$	$0.21\pm 0.05$	$0.21\pm 0.06$
20 mm	Oxy-Hb	$0.66\pm 0.12$	$0.75\pm 0.06$	$0.67\pm 0.08$	$0.68\pm 0.09$
	Deoxy-Hb	$0.58\pm 0.18$	$0.70\pm 0.08$	$0.61\pm 0.07$	$0.61\pm 0.07$
30 mm	Oxy-Hb	$0.77\pm 0.09$	$0.84\pm 0.04$	$0.79\pm 0.06$	$0.79\pm 0.06$
	Deoxy-Hb	$0.70\pm 0.17$	$0.81\pm 0.06$	$0.74\pm 0.06$	$0.74\pm 0.06$

S-D, source-detector; oxy-Hb, oxygenated hemoglobin; deoxy-Hb, deoxygenated hemoglobin.