Table 1 Circular statistics summary. Rho denotes the relative length of the mean vector. Given p-values are for the Rayleigh test. For more information see text
From: Crown-of-thorns starfish have true image forming vision
Experiment | Background | Test type | Stimulus | N | Mean heading (°) | Rho | p-value |
|---|---|---|---|---|---|---|---|
Paired rectangles | grey | angular | 5° | 11 | 63 | 0.13 | 0.839 |
grey | angular | 9° | 10 | 220 | 0.17 | 0.763 | |
grey | angular | 18° | 10 | 46 | 0.20 | 0.682 | |
grey | angular | 32° | 9 | 334 | 0.72 | <= 0.01 | |
grey | angular | 43° | 10 | 345 | 0.68 | <= 0.01 | |
Centred black rectangle | grey | axial | 5° | 10 | 314 | 0.67 | <= 0.01 |
grey | axial | 9° | 10 | 346 | 0.21 | 0.658 | |
grey | axial | 18° | 10 | 357 | 0.25 | 0.547 | |
grey | axial | 32° | 10 | 352 | 0.57 | <= 0.05 | |
grey | axial | 43° | 10 | 5 | 0.80 | <= 0.01 | |
Black and white circle | grey | angular | 4°/5° | 9 | 193 | 0.32 | 0.402 |
grey | angular | 7°/10° | 9 | 49 | 0.51 | 0.096 | |
grey | angular | 14°/20° | 9 | 28 | 0.36 | 0.331 | |
grey | angular | 27°/35° | 10 | 47 | 0.37 | 0.264 | |
grey | angular | 37°/47° | 9 | 60 | 0.41 | 0.23 | |
grey | angular | control | 10 | 3 | 0.16 | 0.788 | |
Black circle | white | angular | control | 9 | 21 | 0.25 | 0.579 |
white | angular | 4° | 8 | 48 | 0.15 | 0.837 | |
white | angular | 7° | 9 | 263 | 0.15 | 0.821 | |
white | angular | 14° | 9 | 334 | 0.65 | <= 0.05 | |
white | angular | 27° | 9 | 348 | 0.79 | <= 0.01 | |
white | angular | 37° | 10 | 5 | 0.66 | <= 0.01 | |
Grey circle | white | angular | 0.1 | 10 | 286 | 0.02 | 0.997 |
white | angular | 0.3 | 10 | 22 | 0.42 | 0.168 | |
white | axial | 0.5 | 10 | 6 | 0.63 | <= 0.05 | |
white | angular | 0.7 | 9 | 13 | 0.57 | <= 0.05 | |
white | angular | 0.9 | 10 | 5 | 0.94 | <0.001 |