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Aftereffect-induced CPP. Mean times (± SEM) rats spent in the chamber paired with the aftereffect of 2 h wheel running vs. the control chamber as a function of the chamber context (N = 32; G: grey; VS: vertical stripes). An ANOVA revealed a significant effect of aftereffect (**p < 0.0005), but no effect of chamber context and no aftereffect × chamber context interaction.
