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Experimental design.
| Experiment | Postnatal day (PD) |
|---|---|
| Handling | 31–39 |
| Novel open field | 40 |
| Familiar open field | 41 |
| Sucrose preference training | 41 |
| Sucrose preference testing | 42 |
| Passive avoidance training | 42 |
| Passive avoidance testing | 43 |
| Learned helplessness training | 43 |
| Learned helplessness testing | 44 |
| Heart rate measurement | 46 |
| Trunk blood collection for corticosterone assay | 46 |
