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. Author manuscript; available in PMC: 2018 Sep 1.
Published in final edited form as: Addict Biol. 2016 Apr 5;22(5):1343–1354. doi: 10.1111/adb.12397

Figure 1.

Figure 1

Results of the multilevel models (MLM) of change in BrAC over the self-administration session (Session 2). Panel A shows the unconditional effects of time derived from the MLM (i.e., the model-implied BrAC) with observed mean BrAC readings superimposed (standard errors in error bars). Panel B shows the simple slopes for the effects of time at high (M+1SD) and low (M−1SD) levels of peak stimulation during session 1. Panel C shows the simple slopes for the effects of time at high (M+1SD) and low (M−1SD) levels of peak sedation during session 1. Panel D shows the simple slopes for the effects of time conditioned on each of the genotype groups. Race is included as a covariate in the genotype model (Panel D).