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Fig. 2. Where ants search for an absent feeder that is normally placed between two
cylinders. Results pool data from two experiments in which the starting pen
was either 40 cm or 100 cm from the feeder. (A) Tests with training cylinders
of equal size. (B) Tests in which one cylinder is smaller and one larger than
in training. Here, and in the remaining figures, the position of the feeder
predicted by the snapshot is shown by a white circle. The contour plot
represents the percentage of time the ants spent in each area; the darker the
grey, the higher the percentage. The darkest area represents 9.8% of the total
search in the training condition (N=71 paths) and 3.81% in the test
condition (N=93 paths). The mean X positions (see Materials and
methods) of the two distributions differ significantly (Wilcoxon two-sample
test; P<0.001, t=8.04, d.f.=162).
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