| Popis: |
In Experiment 1 (N = 213) rat pups were handled (H) in infancy or were non-disturbed controls (C). At weaning Ss were placed into free-environment boxes in the following ratios (N = 16 per box): 16 H:0 C, 12H:4 C, 8 H:8 C, 4 H:12 C, 0 H:16 C. Ss were placed into standard laboratory cages at 50 days and given the open-field emotionality test from 70–73 days of age. In Experiment 2 (N = 63) handled and control Ss were reared in the free environment between weaning and 50 days in one of the following groupings: 16 H:0 C, 8 H:8 C; or 0 H:16 C. Open-field testing was carried out from 76–81 days of age. In Experiment 1 Ss which were mixed together in the free environment (i.e. the 12:4, 8:8, and 4:12 groupings) were less active than Ss not grouped together (p < ·10). There were no significant differences among the different social ratios. In Experiment 2 Ss mixed together were more active than the unmixed groups (p < ·05). Neither set of data is consistent with the original findings of Denenberg & Morton (1962, Experiment 2). In both experiments handled Ss were more active than controls (p < ·01). |
