Table 1.

Internal consistency of adult power studies.

Paper	Age(s)	Sample Size	Paradigm	Type of Power	Consistency Measure(s)	Frequency Band	Consistency
Hill et al. (2020)	Not specified	N = 31	Resting-state	Broad frontal asymmetry	Spearman-Brown	Alpha	0.99
				High frontal asymmetry	Spearman-Brown	Alpha	0.99
Rocha et al. (2020)	Older adults	N = 31	Resting-state	Relative (to nearby frequencies only)	Cronbach's α	Alpha	0.87
Towers and Allen (2008)	Undergraduates	N = 204	Resting-state	Frontal asymmetry	Spearman-Brown	Alpha	0.91
Burgess and Gruzelier (1993)	18–39 years	N = 24	Resting-state	Absolute	Cronbach's α	Delta	0.92
						Theta	0.95
						Alpha	0.95
						Beta	0.95
			Task-related	Absolute	Cronbach's α	Delta	0.90
						Theta	0.94
						Alpha	0.90
						Beta	0.94
Allen et al. (2003)	18–45 years	N = 30	Resting-state	Frontal asymmetry	Cronbach's α	Alpha	0.87
Gold et al. (2013)	18–50 years	N = 79	Resting-state	Frontal aymmetry	Cronbach's α	Alpha	0.76
				Absolute	Cronbach's α	Theta	0.99
Lund et al. (1995)	Mean age of 28.5 years	N = 49	Resting-state	Absolute	Cronbach's α	Delta	0.92
						Theta	0.96
						Alpha	0.96
						Beta	0.95
				Relative	Cronbach's α	Delta	0.90
						Theta	0.94
						Alpha	0.94
						Beta	0.90