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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 4.

Figure 4

Instrumental learning in sign-trackers (ST), goal-trackers (GT) and unpaired rats (UN). After 8 sessions of Pavlovian training animals were divided into STs (N = 20) and GTs (N = 20) as above. The intermediate third was not tested further in this experiment. However, in a third group of animals (UN, Unpaired, N = 14) the CS and US were presented pseudo-randomly. Panel A shows the data for lever contacts during Pavlovian training. Panel B shows the effects of subsequent instrumental training on an FR-1 schedule of reinforcement for 3 consecutive days. After the third day of testing on an FR-1 schedule the animals were transferred to a VI-5 (variable interval 5 sec) schedule of reinforcement for 3 days (see Panel C).