Table 2. Linear Mixed Effects Models Testing Associations Between SSRT and Subjective Response to Amphetamine (Aim 1).

	Estimate	SE	t	p
ARCI MBG (Euphoria)
Order	0.44	0.46	0.95	0.346
Sex	−0.19	0.48	0.41	0.685
Age	0.01	0.07	0.13	0.898
SSRT	−0.01	0.02	0.56	0.578
Drug	−0.16	0.40	0.39	0.696
Time (linear)	−0.33	0.17	1.90	0.061
Time2 (quadratic)	0.04	0.02	1.92	0.057
SSRT × Drug	< −0.01	0.02	0.16	0.875
SSRT × Time	< −0.01	0.01	0.48	0.631
SSRT × Time2	< 0.01	< 0.01	0.38	0.707
Drug × Time	2.00	0.15	13.41	< 0.001
Drug × Time2	−0.21	0.02	10.38	< 0.001
SSRT × Drug × Time	0.02	0.01	3.49	< 0.001
SSRT × Drug × Time2	< −0.01	< 0.01	2.68	0.007
ARCI A (stimulation)
Order	0.46	0.32	1.44	0.155
Sex	−0.41	0.33	1.24	0.220
Age	−0.01	0.05	−0.25	0.803
SSRT	< −0.01	0.01	0.02	0.983
Drug	−0.13	0.26	0.50	0.619
Time (linear)	−0.16	0.07	2.28	0.023
Time2(quadratic)	0.02	0.01	2.04	0.041
SSRT × Drug	< 0.01	0.01	0.21	0.837
SSRT × Time	< −0.01	< 0.01	0.52	0.601
SSRT × Time2	< 0.01	< 0.01	0.01	0.989
Drug × Time	1.30	0.10	13.37	< 0.001
Drug × Time2	−0.14	0.01	10.14	< 0.001
SSRT × Drug × Time	0.01	< 0.01	2.88	0.004
SSRT × Drug × Time2	< −0.01	< 0.01	2.28	0.023

Abbreviation: SSRT, stop signal reaction time.

Note. Significant effects are indicated in a bold font.