Having previously defined the critical distance between two horizontally located visual cues allowing workers of the ant Myrmica sabuleti to mentally add them, and knowing that their sensitivity to a horizontal and a vertical change of orientation differs, we tried to define the distance between two vertically located cues beyond which limit these ants can no longer add up the cues. Making eight experiments on four colonies, and using different vertical distances between two presented cues, we found that this critical distance equals 4 cm, what is in agreement with what we know about this species’ visual perception. Moreover, during every performed experiment, it appeared that these ants better responded to, and thus better perceived, the cues located higher than those located lower. This is to be put in relation with the morphology of their eyes and their position on the head.
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