Skip to main content
Fig. 2 | Frontiers in Zoology

Fig. 2

From: Crown-of-thorns starfish have true image forming vision

Fig. 2

Behavioural results: paired black and white rectangles presented on the mid-intensity grey background. a-e Animals were attracted to stimulus when the angular height of the stimuli was 32° or larger. The stimuli were always presented with the black rectangle to the left. The mean vector of the significant responses is pointing left of 0°, indicating that on average the animals were headed to the black half of the stimulus. In the circular plots, the small, black, filled circles represent the final angular positions of the animals. The direction of the arrow indicates the mean direction and the length of the arrow represents the length of the mean vector (rho). The radius of the circle represents a vector length of 1. The 95 % confidence intervals for the response are indicated by dashed lines, only when the p-value for the Rayleigh test is smaller than 0.05. A summary of the circular statistics is given in Table 1

Back to article page