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Fig. 3. Evaluation of homing directions in experiment I. For each trial, the homing
direction was measured in two coordinate systems. (A) The animal's position at
the end of the homing trip, when it reached the 15 cm-wide peripheral annular
zone of the arena (dashed circle) was coded with respect to the real arena
floor, which was subdivided into 10° sectors. The 0° reference
direction was the radius vector pointing from the centre of the arena to the
standard nest location; positive values corresponded to clockwise angles. As
the return to the nest (curved path) does not start at the arena centre, this
measure entails a bias (see text). (B) The animal's orientation was therefore
assessed by a second measure, at a distance of 35 cm from the start of the
return, with a mobile grid (dotted circle), also subdivided into 10°
sectors. The grid was centred on the start of the return at P2 (or P1), and
its 0° reference direction was aligned with the standard position of the
nest entrance.
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