. Author manuscript; available in PMC: 2023 Jul 10.

Published in final edited form as: Psychopharmacology (Berl). 2021 Apr 24;238(8):2261–2273. doi: 10.1007/s00213-021-05850-7

Table 1.

Preferred model results for acquisition, escalation, and extinction for Experiment 1.

	Model
Fixed Effects	Acquisition	Escalation	1^st h Escalation	Extinction
Initial Status
Intercept	3.28^****	14.17^*	14.18^****	1.55^****
LgA		59.70^****	0.73	−0.10^*
Female	3.00^**			0.04
Session
Intercept	−0.31	0.28	0.28
LgA		5.04^****	0.78^*
Female	−0.70^**
Session × Session
Intercept		−0.004	−0.004
LgA		−0.04	−0.005
Log(Session)
Intercept				−0.40^****
LgA				0.18^***
Female				0.059
Active
Intercept	1.94^*
Female	−2.85^*
Active × Session
Intercept	1.41^****
Female	1.22^***
Random Effects
L1 Residual	14.88^****	202.84^****	14.47^****	0.0092^****
Cov (I,S)		−9.19	0.30	−0.0098^*
Var (I)	1.17^*	545.88^***	15.72^**	0.018^***
Var (S)		8.42^**	0.96^**	0.012^**
Cov (I, Q)		0.24	0.01
Cov (S, Q)		−0.32^*	−0.04^**
Var (Q)		0.02^**	0.002^**
−2 LL	2695.0	5716.7	3909.7	−706.5

The coefficients for the final preferred models for Experiment 1 acquisition, escalation, 1^st h escalation, and extinction are shown above. Cov = covariance, Var = variance, −2 LL = −2 Log Likelihood, I = intercept, S = slope, Q = quadratic.

(p < .05),

^**

(p < .01),

^***

(p < .001), and

^****

(p < .0001).