Table 1.
Housing conditions
| Environmental conditions | Social conditions (# rats/cage) | ||
|---|---|---|---|
| Isolated (1 rat/cage) | Social2 (2 rats/cage) | Social3 (3 rats/cage) | |
| Impoverished (no toys) | II | SI2 | SI3 |
| Enriched (toys) | IE | SE2 | SE3 |
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