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. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: Pharmacol Biochem Behav. 2014 Aug 1;124:443–450. doi: 10.1016/j.pbb.2014.07.012

Figure 1.

Figure 1

This figure shows the conditioned stimuli assumed to be available in a one- (left column) or two-compartment (right column) CPP procedure. Rows 1 (CS+ trials) and 2 (CS− trials) show cues available when training occurs in the light (Panel A); rows 3 and 4 show cues available when training occurs in the dark (Panel B). TG and TH represent that tactile-grid and tactile-hole floors, respectively. VX and VY represent external visual cues that are unique to each side of the apparatus while SL and SR represent spatial location cues on the left and right sides, respectively. The large dashed X’s in the two-compartment diagrams depict the compartment that the mouse is unable to enter on conditioning trials. The X’s shown over VX and VY in Panel B indicate that visual cues are not available in the dark. The (+) and (−) indicate pairing with ethanol or saline injection, respectively.