. Author manuscript; available in PMC: 2014 Oct 1.

Published in final edited form as: Psychopharmacology (Berl). 2013 May 17;229(3):515–525. doi: 10.1007/s00213-013-3135-4

Table 2.

Post-infusion Responses.

FR1 REINFORCEMENT SCHEDULE

SESSION

LAST

BxD 31

2.0

0.6

1.5

0.6

1.7

0.9

3.3

1.1

5.4

2.2

7.4

2.0

BxD 38

0.4

0.2

0.8

0.4

1.8

0.6

5.0

1.3

5.3

1.3

9.65

1.6

BxD 42

1.8

0.5

9.7

2.6

11.9

2.5

14.1

2.4

14.0

2.8

14.1

1.8

BxD 68

2.5

1.3

12.0

2.5

14.7

2.3

15.2

3.8

16.5

2.1

18.2

1.7

FR2 REINFORCEMENT SCHEDULE

SESSION

BxD 31

8.3

1.8

7.0

1.4

7.3

1.6

6.0

1.5

BxD 38

8.5

1.3

7.8

1.3

7.8

1.1

7.7

1.1

BxD 42

7.7

1.0

9.6

2.0

9.6

1.8

10.6

2.2

BxD 68

8.8

1.6

10.7

0.9

11.2

0.9

12.3

1.5

FR5 REINFORCEMENT SCHEDULE

SESSION

BxD 31

87.5

4.2

86.0

4.0

86.2

2.8

90.9

2.0

89.7

1.0

BxD 38

92.8

1.5

94.5

0.9

93.5

1.2

95.6

0.8

95.8

1.1

BxD 42

86.2

3.5

85.6

4.3

87.7

3.1

90.2

1.8

90.4

1.9

BxD 68

94.7

0.8

95.2

1.0

93.2

2.2

95.6

1.5

96.8

1.3

Averages (bold) ± SEM (italics) are expressed as the number of active lever responses during the 20s post-infusion time-out period under FR1, FR2, and FR5 reinforcement schedules between GRL (BxD 31, BxD38) and PRL (BxD 42, BxD 68) strains.

Asterisks indicate significant differences between pooled PRL and GRL strains in all pairwise comparisons. :

at least p<0.05,

^**

at least p<0.01,

^***

p<0.001