. 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 1.

Discrimination Index.

FR1 REINFORCEMENT SCHEDULE

SESSION

LAST

BxD 31

52.9

13.6

69.5

9.9

79.4

7.3

80.4

7.3

81.4

6.1

74.4

3.4

BxD 38

65.8

7.9

71.1

8.4

72.3

6.4

77.0

5.0

81.0

5.1

88.2

2.6

BxD 42

53.8

6.8

65.8

5.4

79.2

4.6

76.1

4.4

83.4

3.2

89.9

1.9

BxD 68

66.2

10.9

79.7

5.4

82.9

7.2

86.9

2.4

89.7

7.0

87.6

7.2

FR2 REINFORCEMENT SCHEDULE

SESSION

BxD 31

88.9

3.5

87.9

3.4

88.0

2.7

90.0

3.7

BxD 38

89.5

1.0

93.4

1.6

93.3

1.6

93.1

1.7

BxD 42

88.8

1.9

88.2

2.7

88.3

2.1

89.9

2.1

BxD 68

92.7

2.0

90.1

2.3

89.6

2.7

89.3

4.0

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 percentage of active responses (calculated as active over total responses) during 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.