Table 2.
Properties of the mapsa
| Animal and map type | Area of colliculus covered (mm2) | Inverse magnification factor (°/mm) | Number of edges in the largest ordered submap (%) | Orientation of the largest ordered submap (°) | Mediolateral polarity (%) | Rostrocaudal polarity (%) |
|---|---|---|---|---|---|---|
| F → C | ||||||
| WT | 0.50 ± 0.06 | 73.4 ± 7.0 | 99.9 ± 0.1 | −20.6 ± 6.4 | 87.8 ± 2.8 | 89.0 ± 4.1 |
| β2 | 0.31 ± 0.05 | 68.5 ± 8.3 | 98.3 ± 1.0 | −14.0 ± 8.1 | 92.4 ± 3.4 | 88.3 ± 3.3 |
| HetTKO | 0.36 ± 0.17 | 76.1 ± 22.7 | 87.2 ± 11.8 | −18.7 ± 8.0 | 86.6 ± 2.8 | 79.3 ± 7.7 |
| HomTKO | 0.38 ± 0.11 | 85.6 ± 11.3 | 65.2 ± 13.0 | −16.3 ± 12.3 | 85.1 ± 4.9 | 63.5 ± 8.8 |
| β2DKO | 0.25 ± 0.11 | 116.7 ± 29.3 | 36.0 ± 21.2 | −14.4 ± 12.8 | 83.1 ± 5.1 | 53.9 ± 4.7 |
| RCrand | 0.50 ± 0.06 | 73.4 ± 7.0 | 11.2 ± 1.6 | −27.6 ± 9.8 | 87.5 ± 2.7 | 50.2 ± 0.9 |
| C → F | ||||||
| WT | 0.55 ± 0.06 | 68.5 ± 7.1 | 98.8 ± 1.4 | +20.3 ± 6.2 | ||
| β2 | 0.36 ± 0.07 | 61.1 ± 8.9 | 96.3 ± 2.9 | +13.8 ± 8.2 | ||
| HetTKO | 0.46 ± 0.18 | 63.6 ± 16.3 | 76.2 ± 10.7 | +20.3 ± 7.8 | ||
| HomTKO | 0.49 ± 0.08 | 67.1 ± 8.6 | 62.3 ± 12.2 | +20.4 ± 15.1 | ||
| β2DKO | 0.46 ± 0.13 | 59.2 ± 6.6 | 33.9 ± 19.1 | +24.6 ± 20.1 |
aInverse magnification factor is the square root of the ratio of the area of visual field covered to the area of colliculus covered. The number of edges is the ratio of the number of edges in the largest submap to the number in the full map, expressed as a percentage. The RCrand (rostrocaudally randomized) WT map was constructed as described in Materials and Methods. In calculating statistics from F → C submaps, data from nodes yielding ectopic projections have been included. Means and SDs are calculated from the means over 20 runs.