Table 2.

Spatial reliability at group level. $A_{S1}$ = number of significant channels at S1; $A_{S2}$ = number of significant channels at S2; $A_{\text{overlap}}$ = number of the same channels significant at both sessions; $R_{\text{quantity}}$ = an intersession measure of the size of the response (number of significant channels) at both sessions; $R_{\text{overlap}}$ = an intersession measure of the spatial overlap of significant channels at both sessions. Results are given for the ${\mathrm{HbO}}_2$ response for all available channels in the sensor array [whole array (${\mathrm{HbO}}_2$)], the HHb response in the sensor array [whole array (HHb)]; both the ${\mathrm{HbO}}_2$ and HHb response for all available channels in the sensor array [whole array (${\mathrm{HbO}}_2$ and HHb)], and the ${\mathrm{HbO}}_2$ responses from channels within the ROI.

	$A_{S1}$	$A_{S2}$	$A_{\text{overlap}}$	$R_{\text{quantity}}$	$R_{\text{overlap}}$
Whole array (${\mathrm{HbO}}_2$)	7	9	7	0.875	0.875
Whole array (HHb)	1	3	0	0.5	0
Whole array (${\mathrm{HbO}}_2$ and HHb)	8	9	8	0.941	0.941
ROI (${\mathrm{HbO}}_2$)	5	5	5	1	1