Fig. 4. Detour vectors associated with rotation of the barrier through 45°. (A) Top: barrier oriented as during training; the green arrows point to the position of the nest relative to the barrier (
). Bottom: barrier rotated through 45° to the west (left) and east (right); the arrows indicate the hypothetical directions of detour vectors according to hypothesis 1 (allocentric system of reference, blue) and hypothesis 3 (egocentric system of reference, green). (B) Zero-vector ants were released at the tip of a barrier rotated either to the west (left side N=9, right side N=9) or to the east (left side N=13, right side N=12). The path density histogram shows the trajectories from the east-rotated barrier together with the mirror-reversed trajectories from the west-rotated barrier. For further explanation, see Fig. 2.
