Table 1.
Time table of daily lever pressing for food reinforcement in SD and F344 rats
| Day 1 | Day 2 | Day 3 | Day 4 | Day 5 | Day 6 | Day 7 | Day 8 | Day 9 | Day 10 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 5 | 2 | 10 | 16 | 19 | 19 | ||||
| 2 | 1 | 0 | 12 | 19 | 20 | |||||
| 3 | 3 | 11 | 13 | 20 | 19 | |||||
| 4 | 10 | 19 | 20 | |||||||
| 5 | 7 | 13 | 11 | 20 | 20 | |||||
| 6 | 8 | 15 | 20 | 20 | ||||||
| 7 | 1 | 3 | 4 | 2 | 3 | 18 | 20 | |||
| 8 | 7 | 5 | 20 | 20 | ||||||
| 9 | 7 | 15 | 19 | 20 | ||||||
| 10 | 7 | 13 | 20 | 2 | 20 | 20 | ||||
| 11 | 4 | 9 | 16 | 20 | 20 | |||||
| 12 | 4 | 10 | 19 | 20 | ||||||
| 13 | 8 | 15 | 19 | 20 | ||||||
| 14 | 6 | 12 | 19 | 20 | ||||||
| 15 | 9 | 9 | 18 | 20 | ||||||
| 16 | 14 | 18 | 20 | |||||||
| 17 | 0 | 4 | 5 | 13 | 20 | 20 | ||||
| 18 | 4 | 4 | 14 | 20 | 20 | |||||
| 19 | 6 | 4 | 6 | 9 | 20 | 20 | ||||
| 20 | 5 | 3 | 13 | 18 | 19 | |||||
| 21 | 4 | 5 | 6 | 6 | 20 | 19 | ||||
| 22 | 2 | 6 | 2 | 0 | 4 | 0 | 2 | 0 | 2 | 0 |
| 23 | 1 | 2 | 3 | 12 | 18 | 19 | ||||
| 24 | 1 | 7 | 6 | 11 | 20 | 1 | 20 | 20 | ||
| 25 | 8 | 5 | 9 | 20 | 20 | |||||
| 26 | 7 | 8 | 6 | 14 | 20 | 20 | ||||
| 27 | 4 | 13 | 16 | 20 | 20 | |||||
| 28 | 9 | 10 | 16 | 19 | 20 | |||||
| 29 | 6 | 3 | 2 | 15 | 20 | 20 | ||||
| 30 | 8 | 8 | 4 | 8 | 15 | 20 | 20 | |||
| 31 | 5 | 3 | 2 | 2 | 1 | 6 | 18 | 20 | ||
| 32 | 7 | 6 | 0 | 2 | 3 | 20 | 20 | |||
| 33 | 7 | 2 | 0 | 3 | 0 | 1 | 0 | 0 | 0 | 0 |
| 34 | 3 | 1 | 1 | 14 | 18 | 20 | ||||
| 35 | 1 | 2 | 1 | 2 | 3 | 2 | 2 | 5 | 0 | 2 |
| 36 | 0 | 5 | 8 | 19 | 1 | 20 | 20 | |||
| 37 | 0 | 6 | 11 | 19 | 20 |
Raw data demonstrating Sprague–Dawley rats (rows 1–19) and Fischer 344 (rows 20–37) rats lever pressing for food.
Table shows the learning rate for each animal in acquiring the task and responding at a 90% criterion (respond for 18 of 20 possible reinforcers) for 2 consecutive days. All SD rats learned the task, whereas 15 of the 18 F344 rats reached criterion and 3 failed to respond for food.