Fig. 5. Homing directions after training in open control maze, in relation to time of day. Expected values 45° and 315°. After mirroring the data of eastbound training they were not significantly different from those after westbound training (see Fig. 1A,B), and therefore the former data were mirrored for this plot. No larger deviations from 45° at some times of the day, nor a significant overall trend was visible, indicating that directional errors induced by the restricted sky view within the channels had been cancelled out due to the perpendicular orientation of segments in the `open' controls.