Fig. 4
From: Crown-of-thorns starfish have true image forming vision
Behavioural results: black-and-white circles on a mid-intensity grey background. a-f Animals did not show directional responses to the circles or the control experiment, where the Plexiglas sheet was presented against the grey background. The angular height of the black centre of the stimulus is given first, followed by the angular height of the entire stimulus. For more details on the circular plots see caption of Fig. 2. A summary of the circular statistics is given in Table 1