Table 5.

Analyses of Variance (ANOVAs) for cue P300 (cP300) and Stimulus Preceding Negativity (SPN) Amplitudes

ERP	ANOVA	Effect
cP300	Group × Certainty Effect	Group	F(1, 160) = 0.69, p = .41, ${\eta }_p^2$ = .004 CI[.00, .05]
		Certainty	F(1, 160) = 13.12, p < .001, ${\eta }_p^2$ = .08 CI[.02, .16]
		Interaction	F(1, 160) = 0.57, p = .45, ${\eta }_p^2$ = .004 CI[.00, .04]
	Group × Valence Effect within Certain Condition	Group	F(1, 155) = 0.46, p = .50, ${\eta }_p^2$ = .003 CI[.00, .04]
		Certain Outcome	F(2, 310) = 31.24, p < .001, ${\eta }_p^2$ = .17 CI[.10, .24]
		Interaction	F(2, 310) = 0.79, p = .46, ${\eta }_p^2$ = .005 CI[.00, .03]
	Group × Valence Effect within Uncertain Condition	Group	F(1, 155) = 0.27, p = .61, ${\eta }_p^2$ = .002 CI[.00, .04]
		Uncertain Outcome	F(1, 155) = 0.03, p = .87, ${\eta }_p^2$ < .001 CI[.00, .02]
		Interaction	F(1, 155) = 0.002, p = .97, ${\eta }_p^2$ < .001 CI[.00, .004]
SPN	Group × Certainty Effect	Group	F(1, 158) < 0.01, p = .96, ${\eta }_p^2$ < .001 CI[.00, .009]
		Certainty	F(1, 158) = 15.74, p < .001, ${\eta }_p^2$ = .09 CI[.02, .18]
		Interaction	F(1, 158) = 12.65, p < .001, ${\eta }_p^2$ = .07 CI[.01, .16]
	Group × Valence Effect within Certain Condition	Group	F(1, 154) = 1.58, p = .21, ${\eta }_p^2$ = .01 CI[.00, .06]
		Certain Outcome	F(2, 308) = 1.14, p = .32, ${\eta }_p^2$ = .01 CI[.00, .03]
		Interaction	F(2, 308) = 0.33, p = .72, ${\eta }_p^2$ = .002 CI[.00, .02]
	Group × Valence Effect within Uncertain Condition	Group	F(1, 154) = 0.70, p = .41, ${\eta }_p^2$ = .005 CI[.00, .05]
		Uncertain Outcome	F(1, 154) = 0.12, p = .73, ${\eta }_p^2$ = .001 CI[.00, .03]
		Interaction	F(1, 154) = 0.43, p = .52, ${\eta }_p^2$ = .003 CI[.00, .04]

Note. Significant main effects and interactions (ps < .05) are bolded for ease of identification. Significant analyses are interpreted in the cP300 and SPN sections of the Results. CI = 95% confidence interval for ${\eta }_p^2$.