Table 2.

Multivariate und Univariate Multiple Linear Regression Models

		Multivariate Model			Univariate Models
						3-back accuracy		3-back speed		Δ switch costs
Parameter		df	Wilks’ λ	approx. F	df	F1	F2	F1	F2	F1	F2
Step 1	Condition (placebo vs. sulpiride)	3	0.96	1.04	1	0.20	0.01	0.09	0.07	2.89	3.30
	aE	3	0.85	4.53**	1	5.06*	1.62	2.14	2.01	5.40*	1.83
	Condition * aE	3	0.86	4.15**	1	8.32**	4.46*	0.01	0.04	4.12*	2.76
	Error	76			78
Step 2	3-back accuracy				1						4.32*
	3-back speed				1						0.22
	Δ switch costs				1		5.41*		0.02
	Condition * 3-back accuracy				1						7.72**
	Condition * 3-back speed				1						0.09
	Condition * Δ switch costs				1		8.72**		0.58
	Error				74

Note. N 82; F1 F-statistics for the step 1 model; F2 F-statistics for the step 2 model; aE Agentic Extraversion; Δ switch costs switch cost difference (switch costs perseveration minus switch costs learned irrelevance). Agentic Extraversion was centered within condition

*p < .05

**p < .01

***p < .001