Table 1.
Summary of the animals' characteristics, response rate, and Δ scores.
| Group | Monkey | Years of age | Years of shared housing | Intimacy index I | Response rate (per min) | Mean Δ (% gain) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alone | Audience | Coaction | Social | Audience | Coaction | Social | ||||||||
| Δ | p | Δ | p | Δ | p | |||||||||
| Dyad 1 | ♂ | 9 | 0 | 0 | 1.9 | 2.6 | 3 | 2.8 | 37 | 0.003 | 57 | 0.000 | 46 | 0.000 |
| ♀ | 11 | 0 | 0 | 2 | 3.2 | 3 | 3.1 | 60 | 0.000 | 52 | 0.004 | 57 | 0.000 | |
| Dyad 2 | ♂ | 8 | 3 | 0.4 | 0.5 | 0.9 | 1.7 | 1.2 | 76 | 0.040 | 237 | 0.019 | 144 | 0.002 |
| ♀ | 11 | 3 | 0.3 | 0.4 | 1 | 1.5 | 1.2 | 144 | 0.010 | 283 | 0.030 | 200 | 0.001 | |
| Triad | ♀1 | 4 | 4 | 1 | 1.7 | 3.9 | 3.7 | 3.8 | 191 | 0.000 | 175 | 0.000 | 123 | 0.000 |
| ♀2 | 4 | 4 | 1 | 1.1 | 4.2 | 4.3 | 4.2 | 256 | 0.000 | 269 | 0.000 | 282 | 0.000 | |
| ♀3 | 4 | 4 | 1 | 0.7 | 3.1 | 2 | 2.6 | 524 | 0.000 | 298 | 0.001 | 305 | 0.000 | |
| Average | 7 | 3 | 0.5 | 1.2 | 2.7 | 2.8 | 2.7 | 184 | 196 | 165 | ||||
| sem | 1 | 1 | 0.2 | 0.3 | 0.5 | 0.4 | 0.4 | 64 | 40 | 39 | ||||
Social, scores for audience and coaction taken together; Mean Δ, percent change in response rate relative to the animal's average performance during alone sessions; p-values, significant facilitation revealed by one-sample t-tests relative to zero. Within each group, the animals are listed in hierarchical order, the top-ranking animal appearing first. To the best of our knowledge, there was no genetic link between the members of each group.