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Mean number of reinforcers per session during each consecutive five-session block for the rats exposed to the optional-clock procedure and to the single-S− procedure in Experiment 2.
| Session blocks | Rat | |||||
| R13 | R14 | R15 | R16 | R17 | R18 | |
| Optional clock | One S− | |||||
| 1 | 22.0 | 26.0 | 18.6 | 26.8 | 26.4 | 27.8 |
| 2 | 13.8 | 24.8 | 19.6 | 25.8 | 26.4 | 28.0 |
| 3 | 19.0 | 25.2 | 21.0 | 24.0 | 25.2 | 24.4 |
| 4 | 26.8 | 21.4 | 23.8 | 25.2 | 18.8 | |
| Means | 18.3 | 25.7 | 20.2 | 25.1 | 25.8 | 24.8 |
