Table 1.
Group | Fixed ratio scheduled (FR5) | Progressive ratio schedule | |||
---|---|---|---|---|---|
Active lever |
Inactive lever |
Time-out responding |
Active lever | Inactive lever | |
Contingent NIC + VS (0.01 mg/kg per infusion), n=9 | 83.42±10.17 | 2.22±0.45 | 11.47±1.52 | 106.22±10.94 | 1.83±0.34 |
Noncontingent NI + VS (0.01 mg/kg per infusion), n=11 | 78.39±8.97 | 2.50±0.38 | 13.50±2.00 | 95.34±6.12 | 2.34±0.32 |
Contingent NIC + VS (0.03 mg/kg per infusion), n=8 | 57.66±7.41 | 3.50±0.76 | 10.78±1.49 | 131.66±14.55 | 2.88±0.59 |
Noncontingent NIC + VS (0.03 mg/kg per infusion), n=11 | 62.93±4.82 | 3.68±0.50 | 7.80±0.77 | 98.60±10.90 | 3.38±0.39 |
Contingent NIC + VS (0.09 mg/kg per infusion), n=10 | 54.23±4.19 | 1.20±0.29 | 5.85±0.90 | 122.78±14.79 | 4.43±0.88 |
Noncontingent NIC + VS (0.09 mg/kg per infusion), n=11 | 67.75±6.73 | 2.82±0.51 | 9.34±1.07 | 158.91±15.46 | 4.39±0.62 |
Contingent SAL + VS, n=8 | 24.88±3.30 | 1.38±0.30 | 5.19±0.75 | 42.59±6.75 | 2.81±0.54 |
Contingent SAL + no VS, n=9 | 5.25±0.81 | 1.78±0.36 | 2.33±0.42 | 8.44±1.49 | 3.00±0.69 |
Contingent NIC + no VS (0.01 mg/kg per infusion), n=6 | 3.79±0.66 | 1.25±0.53 | 2.13±0.36 | 8.63±2.41 | 2.33±0.51 |
Contingent NIC + no VS (0.03 mg/kg per infusion), n=6 | 2.71±0.38 | 1.38±0.77 | 1.46±0.29 | 5.38±1.27 | 2.08±0.58 |
Contingent NIC + no VS (0.09 mg/kg per infusion), n=6 | 38.67±7.91 | 4.63±0.97 | 13.04±2.85 | 127.13±33.10 | 17.25±5.27 |
The average responding during the 1-min time-out period after each reinforcer delivery is also indicated for the last 4 days of an FR5 schedule