Table 2.

Results of the significance analysis of PEO on the Fp, F, P, and O regions under stimulation with different colours.

Site	Colour	Wave	Before Inhalation (μv2)	After Inhalation (μv2)
Fp	white	delta	8.69 ± 0.25	10.26 ± 0.82 **
		theta	2.72 ± 0.29	4.05 ± 0.13 **
		alpha	1.94 ± 0.16	3.41 ± 0.04 ***
		beta	0.89 ± 0.02	1.17 ± 0.10 **
	red	delta	4.60 ± 0.45	7.90 ± 0.34 ***
		theta	1.76 ± 0.03	7.19 ± 0.96 ***
		alpha	1.18 ± 0.05	2.39 ± 0.14 ***
		beta	0.88 ± 0.09	1.68 ± 0.12 ***
	blue	delta	6.07 ± 0.26	6.18 ± 0.45
		theta	1.95 ± 0.04	2.68 ± 0.13
		alpha	1.45 ± 0.05	1.98 ± 0.05 ***
		beta	0.46 ± 0.03	1.13 ± 0.08 **
F	white	delta	5.77 ± 1.30	7.35 ± 1.68
		theta	2.43 ± 0.76	2.32 ± 0.57
		alpha	1.36 ± 0.35	2.47 ± 0.61 ***
		beta	0.59 ± 0.10	0.74 ± 0.16
	red	delta	3.60 ± 0.98	4.27 ± 1.05
		theta	1.56 ± 0.57	4.64 ± 2.84 **
		alpha	0.88 ± 0.22	1.36 ± 0.39
		beta	0.54 ± 0.07	0.82 ± 0.18 **
	blue	delta	3.88 ± 0.89	4.65 ± 1.00
		theta	1.64 ± 0.64	1.88 ± 0.59
		alpha	0.92 ± 0.22	1.25 ± 0.30
		beta	0.52 ± 0.09	0.54 ± 0.10
P	white	delta	3.77 ± 0.85	3.59 ± 1.06
		theta	1.64 ± 0.28	1.28 ± 0.39
		alpha	1.56 ± 0.24	2.26 ± 0.32 ***
		beta	0.54 ± 0.05	0.65 ± 0.06 *
	red	delta	3.32 ± 1.02	3.29 ± 1.14
		theta	1.09 ± 0.32	1.64 ± 0.43 *
		alpha	0.92 ± 0.16	1.76 ± 0.10 ***
		beta	0.47 ± 0.05	0.62 ± 0.04 ***
	blue	delta	2.71 ± 0.70	3.61 ± 1.15
		theta	1.08 ± 0.35	1.44 ± 0.42
		alpha	0.92 ± 0.17	1.43 ± 0.35 **
		beta	0.46 ± 0.06	0.52 ± 0.08
O	white	delta	3.28 ± 0.23	3.42 ± 0.05
		theta	1.47 ± 0.14	1.09 ± 0.06 ***
		alpha	1.99 ± 0.06	2.27 ± 0.36
		beta	0.78 ± 0.04	0.94 ± 0.10
	red	delta	2.82 ± 0.03	2.88 ± 0.19
		theta	1.01 ± 0.04	1.48 ± 0.04 ***
		alpha	1.10 ± 0.14	2.14 ± 0.35 **
		beta	0.71 ± 0.07	1.02 ± 0.06 **
	blue	delta	2.43 ± 0.23	3.19 ± 0.02 ***
		theta	0.92 ± 0.05	1.30 ± 0.08 ***
		alpha	1.34 ± 0.14	1.80 ± 0.23
		beta	0.71 ± 0.10	0.76 ± 0.07

p-values: * < 0.05, ** < 0.001, *** < 0.0001.