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Predicted summation ratios (SRs) and slopes of the psychometric function for two different forms of summation (MAX and linear sum) with linear and accelerating contrast transducers at threshold and a compressive transducer above threshold.
| Model | pedestal contrast (%) | SR (dB) | Weibull β checks | Weibull β full |
|---|---|---|---|---|
| MAX, linear | 0 | 5.0 | 1.4 | 1.2 |
| MAX, C2.4 | 0 | 3.5 | 4.0 | 3.0 |
| MAX, C0.4 | 32 | 5.2 | 1.3 | 1.1 |
| Σ, linear | 0 | 6.0 | 1.3 | 1.3 |
| Σ, C2.4 | 0 | 4.8 | 3.1 | 3.1 |
| Σ, C0.4 | 32 | 5.9 | 1.3 | 1.3 |
