Table 2.

Effect sizes (partial η²) obtained for the effect of difficulty over all the subjects for the level of HbO₂ measured for each optodes (plus main effect size over all optodes), depending on the type of filter used for signal processing.

Optode number	1	2	3	4	5	6	7	8
IIR	0.34	0.36	0.48	0.35	0.15	0.32	0.32	0.00
MACD	0.51	0.44	0.50	0.53	0.24	0.26	0.15	0.01
Augmented Kalman (Q∕R = 0.50)	0.64	0.55	0.57	0.55	0.38	0.36	0.39	0.15
Optode number	9	10	11	12	13	14	15	16	All
IIR	0.29	0.26	0.32	0.11	0.41	0.34	0.33	0.30	0.36
MACD	0.15	0.01	0.31	0.12	0.50	0.25	0.39	0.38	0.33
Augmented Kalman (Q∕R = 0.50)	0.42	0.35	0.53	0.39	0.55	0.55	0.52	0.49	0.52

The effect sizes corresponding to a significant effect (p < 0.05) after correction for multiple comparisons are reported in bold font.