Table 1.
Summary of all trial phases.
| trial type | button location | distance between buttons (m) | criterion to pass | |
|---|---|---|---|---|
| Phase 0 | simultaneous release | A | 2.6 | 8 out of 10 over two sessions (80%) |
| Phase 1 | incremental delays (1–5 s) | A | 2.6 | 3 in a row |
| Phase 2 | randomized delays (simultaneous – 5 s) | A | 2.6 | 16 out of 20 in a single session (80%) |
| Phase 3 | incremental delays (8–20 s) | A | 2.6 | 3 in a row |
| Phase 4 | randomized delays (1–20 s) | A | 2.6 | test (20 trials per dolphin) |
| Phase 5 | restricted vision 1: simultaneous release | B | 3.3 | 3 in a row |
| Phase 6a | restricted vision 1: randomized delays (simultaneous, 5 s and 10 s) | B | 3.3 | test (∼40 trials per location) |
| Phase 7a | restricted vision 2: randomized delays (simultaneous, 5 s and 10 s) | C | 8 | test (∼40 trials) |
| Phase 8a | restricted vision 3: randomized delays (simultaneous, 5 s and 10 s) | D | 17.65 | test (∼40 trials) |
aOnly the male dyad took part in these phases as they excelled in the initial trial phases.