Table 2.
Distribution of motives in the human and computer treatments
| Treatment | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Human | Computer | ||||||||
| Type | Free rider (N = 53) | Conditional cooperator (N = 49) | Humped cooperator (N = 13) | Other (N = 2) | Free rider (N = 80) | Conditional cooperator (N = 27) | Humped cooperator (N = 10) | Other (N = 0) | |
| * Motives for answering “yes” | Altruism | 0 | 9 | 2 | 1 | – | – | – | – |
| Social norm | 5 | 22 | 9 | 1 | 10 | 18 | 6 | – | |
| Self-image | 0 | 10 | 0 | 0 | 0 | 6 | 1 | – | |
| Social image | 0 | 1 | 0 | 0 | 0 | 1 | 1 | – | |
| Other | 0 | 5 | 1 | 0 | 3 | 2 | 2 | – | |
| Motives for answering “no” | Self-interest | 24 | 0 | 1 | 0 | 47 | 0 | 0 | – |
| Social norm | 20 | 2 | 0 | 0 | 17 | 0 | 0 | – | |
| Other | 4 | 0 | 0 | 0 | 3 | 0 | 0 | – | |
*Response to question whether participants’ contributions depended on others’ contributions. Question asked: “In the decision you just made, did your contribution depend on the contributions of other members of your group?”