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. Author manuscript; available in PMC: 2010 May 15.
Published in final edited form as: Biol Psychiatry. 2008 Oct 18;65(10):869–873. doi: 10.1016/j.biopsych.2008.09.006

Figure 2.

Figure 2

Test for conditional reinforcement in the sign-trackers (ST, N = 18), goal-trackers (GT, N = 18) and Unpaired animals (UN, N = 20) described in Fig. 1. On this test a nose poke into one port (active) resulted in presentation of the lever-CS for 2 sec. Nose pokes into the other port (inactive) had no consequence. Panel A shows the mean + SEM number of active and inactive nose pokes for each of the three groups. Panel B shows the number of lever contacts during the entire 40 min test.