Table 2. Fits to the Davison and Jenkins (1985) model for concurrent-schedule performance. For each condition, responses following Food Deliveries 7, 8, and 9 in each component across all pigeons was combined and fitted by optimization to Equation 2 in logarithmic terms. Optimal values of response–food discriminability (dr) and bias caused by the delays (log c) are shown with the proportion of data variance accounted for (VAC).
| Condition | Phase | Delays (s) | dr | log c | VAC |
| 4 | 1,2 | 0,0 | 3.41 | 0.08 | 1.00 |
| 17 | 1 | 0,2 | 5.00 | 0.10 | 1.00 |
| 18 | 1 | 4,0 | 5.59 | −0.04 | 1.00 |
| 19 | 1 | 0,6 | 4.42 | 0.31 | 1.00 |
| 20 | 1 | 8,0 | 5.84 | −0.39 | 0.99 |
| 21 | 2 | 1,1 | 4.73 | 0.02 | 0.99 |
| 22 | 2 | 2,2 | 4.08 | 0.05 | 1.00 |
| 23 | 2 | 3,3 | 4.50 | 0.05 | 1.00 |
| 24 | 2,3 | 4,4 | 4.25 | 0.02 | 0.99 |
| 25 | 3 | 2,6 | 4.73 | 0.27 | 0.99 |
| 26 | 3 | 7,1 | 5.58 | −0.25 | 0.97 |
| 27 | 3 | 3,5 | 4.84 | 0.14 | 0.99 |
| 28 | 3 | 1,7 | 4.66 | 0.29 | 1.00 |
| 29 | 3 | 5,3 | 4.52 | 0.00 | 0.99 |
| 30 | 2,3 | 4,4 | 4.53 | 0 | 1.00 |