Table 5.

Internal consistency of adult ERP peak amplitude and mean amplitude studies.

Paper	Age(s)	Sample Size	Consistency Measure	ERP Measure(s)	Consistency
Cassidy et al. (2012)	19–35 years	N = 25	Spearman-Brown	P1 Peak	0.73
				N1 (P08) Peak	0.88
				N1 (P07) Peak	0.89
				P3a Peak	0.93
				P3a Difference Peak	0.66
				P3b Peak	0.73
				P3b Difference Peak	0.63
				ERN Peak	0.64
				ERN Difference Peak	0.72
				Pe Peak	0.88
				Pe Difference Peak	0.89
				P400 Peak	0.87
				N170 Peak	0.81
				ERN Peak-to-Peak	0.51
				ERN Difference Peak-to-Peak	0.44
				P3a Mean	0.9
				P3a Difference Mean	0.70
				P3b Mean	0.68
				P3b Difference Mean	0.71
				Pe Mean	0.76
				Pe Difference Mean	0.85
				P400 Mean	0.88
				Area Under the P3a	0.89
				Area Difference P3a	0.73
				Area Under the P3b	0.63
				Area Difference P3b	0.74
				Area Under the Pe	-0.08
				Area Difference Pe	0.84
				Area Under the P400	0.73
Levinson et al. (2017)	Undergraduates	N = 59	Spearman-Brown	FN Mean	0.80
				RewP Mean	0.86
			Cronbach's α	FN Mean	0.82
				RewP Mean	0.86
Walhovd & Fjell (2002)	Mean age of 56.1 years	N = 59	Spearman-Brown	P3 (Pz) Peak	0.92
				P3 (Cz) Peak	0.93
				P3 (Fz) Peak	0.84
Hämmerer et al. (2012)	Younger adults (mean age = 24.27 years)	N = 47	Spearman-Brown	Go-P3 Peak	0.96
	Older adults (mean age = 71.24 years)	N = 47	Spearman-Brown	Go-P3 Peak	0.89
Hajcak et al. (2017)	Not specified	N = 53	Spearman-Brown	ERN Mean	0.75
			Cronbach's α	ERN Mean	0.75
Meyer et al. (2013)	Mean age of 19.14 years	N = 43	Cronbach's α	ERN Mean	0.70
D.M. Olvet and Hajack (2009)	Undergraduates	N = 45	Spearman-Brown	CRN Peak	0.98
				ERN Peak	0.86
				ERN-CRN Difference Peak	0.80
				Area Under the CRN	0.98
				Area Under the ERN	0.86
				Area Difference ERN-CRN	0.71
				Area Under the Pe	0.87
Bresin and Verona (2021)	Mean age of 29 years	N = 55	Spearman-Brown	P3 Incongruent Mean	0.92
				P3 Congruent Mean	0.93
				P3 No-Go Mean	0.95
				P3 Go Mean	0.95
				ERN Mean	0.80
				CRN Mean	0.92
				Pe Mean	0.78
				Pc Mean	0.94
Foti et al. (2013)	18–65 years (Healthy Individuals)	N = 52	Cronbach's α	ERN Mean Flanker	0.86
				ΔERN Mean Flanker	0.84
				Pe Mean Flanker	0.81
				ΔPe Mean Flanker	0.83
				ERN Mean Picture/Word Task	0.41
				ΔERN Mean Picture/Word Task	0.69
				Pe Mean Picture/Word Task	0.66
				ΔPe Mean Picture/Word Task	0.79
	28–68 years (Patients with Psychotic Illness)	N = 84	Cronbach's α	ERN Mean Flanker	0.63
				ΔERN Mean Flanker	0.48
				Pe Mean Flanker	0.75
				ΔPe Mean Flanker	0.73
				ERN Mean Picture/Word Task	0.35
				ΔERN Mean Picture/Word Task	0.40
				Pe Mean Picture/Word Task	0.28
				ΔPe Mean Picture/Word Task	0.39
Pontifex et al. (2010)	18–25 years and 60–73 years	N = 83	Cronbach's α	ERN Mean	0.96
				Pe Mean	at least 0.90
Sandre et al. (2020)	Mean age of 20.1 years	N = 263	Spearman-Brown	ERN Peak (Cz)	0.80
				ERN Peak (FCavg)	0.76
				CRN Peak (Cz)	0.82
				CRN Peak (FCavg)	0.72
				ERN Peak-to-Peak (Cz)	0.75
				ERN Peak-to-Peak (FCavg)	0.67
				CRN Peak-to-Peak (Cz)	0.54
				CRN Peak-to-Peak (FCavg)	0.47
				ERN Mean (Cz)	0.81
				ERN Mean (FCavg)	0.78
				CRN Mean (Cz)	0.97
				CRN Mean (FCavg)	0.97
			Cronbach's α	ERN Peak (Cz)	0.73
				ERN Peak (FCavg)	0.63
				CRN Peak (Cz)	0.77
				CRN Peak (FCavg)	0.68
				ERN Peak-to-Peak (Cz)	0.74
				ERN Peak-to-Peak (FCavg)	0.64
				CRN Peak-to-Peak (Cz)	0.80
				CRN Peak-to-Peak (FCavg)	0.66
				ERN Mean (Cz)	0.63
				ERN Mean (FCavg)	0.57
				CRN Mean (Cz)	0.75
				CRN Mean (FCavg)	0.70
Xu and Inzlicht (2015)	Mean age of 19.2 years	N = 39	Cronbach's α	ERN Mean	0.59
				CRN Mean	0.97
				ΔERN Mean	0.74
				Pe Mean	0.94
				ΔPe Mean	0.92