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. Author manuscript; available in PMC: 2018 Mar 1.
Published in final edited form as: Behav Brain Res. 2016 Nov 24;320:302–315. doi: 10.1016/j.bbr.2016.11.024

Figure 2.

Figure 2

Schematic illustration of the experimental design for Experiment 2. A, Following Pavlovian training with a food unconditioned stimulus (US) and lever (CS), rats were classified as STs or GTs and then started training on the sustained attention task (SAT). Once animals reached asymptotic performance at the task, rats were implanted with intravenous jugular catheters and trained to self-administer cocaine (US) in the absence of any explicit cue. Once animals had acquired cocaine self-administration, they entered a second cocaine self-administration procedure called Intermittent Access (IntA; DS+ = tone; DS− = white noise). After IntA training, animals went back to SAT before one of three distractor test day conditions (independent groups of rats were used for each distractor test day condition): DS+ Only, DS+ w Cocaine or Non-Contingent Cocaine (NC-coc). B, Each test day was comprised of 12 - 5 min blocks, including Blocks 3 and 9 with the distractor specific for test day (Dist), and Blocks 2 and 8 which served as baseline (BL) blocks for comparisons.