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Contingency table (2 × 2) illustrating the number of choices made by all individuals across all alternating sessions as a function of their partner’s choice in the previous trial
| Partner’s choice at trial n − 1 (%) |
|||
| Actor’s choice at trial n | Selfish | Prosocial | Total |
| Selfish | 77 (23.2) | 255 (76.8) | 332 (100) |
| Prosocial | 268 (26.0) | 764 (74.0) | 1,032 (100) |
