1                        Water-restricted rats were trained to press 1 of 2 levers if a sampled stimulu

2 use model of drug relapse, C57BL/6 (B6) mice were trained to press a lever for infusions of cocaine (

3 ague-Dawley rats, on restricted food intake, were trained to press a lever for sucrose pellets on a C

4                                         Rats were trained to press a lever to deliver electrical stim

5                                         Rats were trained to press a lever to receive intravenous coc

6                                         Rats were trained to press a lever to self-administer cocaine

7 in conscious control over the hindlimb, rats were trained to press a pedal and the encoding of hindli

8 ed instrumental chain schedule in which rats were trained to press one lever (seeking; SL) to gain ac

9                        Water-restricted rats were trained to press one lever after KCl presentation a

10                                   Rats (n=9) were trained to press one lever for water reinforcement

11                        Water-restricted rats were trained to press one of two levers if a sampled tas

12 orsal hippocampus and sham-lesioned controls were trained to press two levers, each of which delivere