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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 11 63 0.13 0.839
grey angular 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 10 314 0.67 <= 0.01
grey axial 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 8 48 0.15 0.837
white angular 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