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Fig. 4. The straightness and consistency of trajectories. (A-C) Measure of the
straightness of food-bound and homeward trajectories plotted against run
number. (A) Ants that only performed food-bound routes. (B,C) Ants that
performed both food-bound and homeward routes. (D-F) Consistency of
trajectories plotted against run number for ants grouped as in A-C. Thin lines
plot the straightness or consistency of individual ants over time. The thick
black line and the grey area show the overall mean and the 95% confidence
interval, respectively. Both straightness (repeated measures ANOVA;
F=39.7; d.f.=2,48; P<0.005) and consistency (repeated
measures ANOVA; F=10.2; d.f.=2,46; P<0.005) improved with
experience. There was a significant difference between the groups in their
straightness (one-way ANOVA, F=28.8; d.f.=2,24; P<0.005),
but not in their consistency (one-way ANOVA, F=1.2; d.f.=2,23;
P=0.313). The two types of food-bound paths were significantly
straighter than homeward paths, but were not significantly different from each
other.
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