Table 1.
Feedback's effect on area summation curve features and model parameters.
| High contrast | Control | Feedback inactive | p-value |
|---|---|---|---|
| Summation field diameter (°) | 0.46 ± 0.20 | 0.51 ± 0.22 | 0.01 |
| Peak response rate (s−1) | 54 ± 32 | 59 ± 35 | 0.06 |
| Surround diameter (°) | 4.4 ± 1.5 | 4.1 ± 1.6 | 0.009 |
| Asymptote rate (s−1) | 12 ± 15 | 19 ± 20 | <0.001 |
| SSI (a.u.) | 0.79 ± 0.17 | 0.71 ± 0.22 | <0.001 |
| kD (a.u.) | 1730 [3110] | 1770 [2440] | 0.7 |
| kN (a.u.) | 12.9 [13.8] | 7.99 [14.5] | 0.2 |
| wD (°) | 0.32 ± 0.25 | 0.31 ± 0.18 | 0.8 |
| wN (°) | 1.96 ± 1.29 | 1.72 ± 1.22 | 0.006 |
| Low contrast | Control | Feedback inactive | p-value |
| Summation field diameter (°) | 0.71 ± 0.65 | 0.72 ± 0.38 | 0.9 |
| Peak response rate (s−1) | 32 ± 22 | 37 ± 27 | 0.01 |
| Surround diameter (°) | 4.6 ± 1.6 | 4.7 ± 1.5 | 0.6 |
| Asymptote rate (s−1) | 9.6 ± 12 | 12 ± 14 | 0.01 |
| SSI (a.u.) | 0.71 ± 0.26 | 0.68 ± 0.25 | 0.10 |
| kD (a.u.) | 532 [613] | 450 [817] | 1 |
| kN (a.u.) | 5.02 [5.89] | 3.79 [5.82] | 0.1 |
| wD (°) | 0.39 ± 0.29 | 0.40 ± 0.20 | 0.8 |
| wN (°) | 2.14 ± 1.31 | 2.11 ± 1.33 | 0.6 |
Mean ± SD and t-test used everywhere except for kD and kN reported as median [IQR] and Mann-Whitney U-test.