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. Author manuscript; available in PMC: 2008 Oct 8.
Published in final edited form as: Drug Alcohol Depend. 2007 Apr 16;90(2-3):183–192. doi: 10.1016/j.drugalcdep.2007.03.005

Figure 1. Model of multiple mediation effects.

Figure 1

The independent variable X (stimulant dependence) affects the dependent variable Y (temporal-processing measure) either directly (c') or indirectly (ab path) via the mediators M1 to M4.