Sucrose pre-training
| Day 1 | Day 2 | Day 3 | |
|---|---|---|---|
| Left Lever | 21±3 | 20±3 | 27±5 |
| Right Lever | 43±6 | 37±4 | 41±5* |
| Time | 40±5 | 28±3 | 20±1## |
The lever preference (left or right) and time taken to obtain 30 reinforcers during 3 consecutive days of sucrose pretraining. *p<0.05 versus day 3, left lever, ##p<0.01 versus time to obtain 30 reinforcers on day 1.