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. Author manuscript; available in PMC: 2013 Mar 5.
Published in final edited form as: Exp Clin Psychopharmacol. 2012 Aug 6;20(5):352–363. doi: 10.1037/a0029135

Table 1.

Reinforcers Earned at Criteria for Acquisition, Extinction, and Reacquisition

Reinforcer/phase WT D3+/− D3−/−
Cocaine 0.32 mg/kg/infusion (N = 6)
(N = 1)
(N = 1)
  Acquisition 56.5 ± 9.8* 58.0n/a 47.8n/a
  Extinction 13.0 ± 2.6 24 22
  Reacquisition 58.4 ± 16.2* 50n/a 54n/a

Cocaine 1.0 mg/kg/infusion (N = 8) (N = 4)
(N = 4)
  Acquisition 23.9 ± 1.2*** 23.7 ± 1.8*** 23.1 ± 1.4**
  Extinction 8.3 ± 2.5 6.3 ± 0.9 7.3 ± 2.7
  Reacquisition 22.8 ± 1.8*** 25.7 ± 2.1*** 24.8 ± 3.0**

Liquid food (N = 14)
(N = 10)
(N = 11)
  Acquisition 69.9 ± 2.9*** 70.5 ± 5.0*** 61.3 ± 3.9***
  Extinction 20.0 ± 1.9 21.4 ± 2.6 21.5 ± 2.8
  Reacquisition 65.4 ± 4.7*** 63.2 ± 7.3*** 68.3 ± 4.6***

Note. In mice that met acquisition criteria, there was no significant effect of D3 genotype on the number of reinforcers earned at criteria for acquisition, extinction, or reacquisition.

*

p < .05.

**

p < .01.

***

p < .001 vs. extinction (Tukey's test).

n/a

Statistical analysis not applicable.

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