Table 5. Experiment 2: comparisons of absolute and relative alpha.

Results of paired-samples t-tests for log of absolute and relative spectral alpha.

Region	Groups
	Normal sleep (NS)		Sleep restriction (SR)
	M	SD	M	SD	N	df	t	Sig.	d	99% CI
Absolute power
Log left frontal	1.14	0.93	0.92	0.22	21	20	2.62	0.016	0.57	[−0.06 to 1.19]
Log left central	1.03	0.19	0.74	0.20	21	20	2.97	0.008*	0.65	[0.01–1.28]
Log left occipital	2.12	0.24	1.88	0.26	21	20	1.91	0.070	0.42	[−0.19 to 1.02]
Log right frontal	1.07	0.19	0.86	0.20	21	20	2.23	0.037	0.49	[−0.13 to 1.10]
Log right central	1.20	0.21	0.86	0.22	21	20	3.12	0.005*	0.68	[0.03–1.32]
Log right occipital	2.39	0.25	2.10	0.27	21	20	2.66	0.015	0.58	[−0.05 to 1.20]
Relative power
Left frontal	1.85	0.19	1.69	0.19	21	20	1.54	0.139	0.34	[−0.26 to 0.93]
Left central	2.21	0.19	1.96	0.16	21	20	2.48	0.022	0.54	[−0.08 to 1.16]
Left occipital	3.01	0.19	2.90	0.22	21	20	0.84	0.441	0.18	[−0.40 to 0.76]
Right frontal	1.74	0.17	1.60	0.18	21	20	1.54	0.140	0.34	[−0.06 to 0.73]
Right central	2.40	0.18	2.09	0.21	21	20	3.25	0.004*	0.71	[0.06–1.35]
Right occipital	3.18	0.19	3.00	0.22	21	20	1.83	0.083	0.40	[−0.21 to 1.00]

Note:

^*p < 0.008 indicates a significant difference. Confidence intervals were created using the Bonferroni corrected alpha level (0.008)