Table 2.
Classification of cells according to orientation, colour and edge selectivity
| VI (2,3) | V2 | |||||
|---|---|---|---|---|---|---|
| Tested | Selective | % | Tested | Selective | % | |
| Orientation (modulation > 0.6) | 313 | 253 | 81 | 388 | 306 | 79 |
| Colour (selectivity index > 0.5) | 207 | 132 | 64 | 254 | 115 | 45 |
| Hue (Pchrom < 0.01) | 180 | 79 | 44 | 223 | 79 | 35 |
| Brightness (Plum < 0.01) | 180 | 124 | 69 | 223 | 132 | 59 |
| Hue and brightness (Pchrom < 0.01 and Plum < 0.01) | 180 | 62 | 34 | 223 | 55 | 25 |
| Edge (enhancement index > 0.6) | 154 | 129 | 84 | 210 | 165 | 79 |
| Side (asymmetry ratio > 2) | 134 | 58 | 42 | 163 | 67 | 41 |
Data from layers 2 and 3 of striate cortex and from area V2. Pchrom and Plum are the P values of the chromaticity and luminance effects, respectively (see Methods).