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Fig. 3. Search distributions for an absent feeder that is normally placed between
two cylinders. Starting pen was 70 cm from the feeder. (A) Tests with training
cylinders of equal size. (B) Tests with two smaller cylinders. The darkest
area represents 18.98% of the search in the training condition (N=41
paths) and 4.32% in the test condition (N=42 paths). (C,D) Search
distribution with small cylinders, when ants were fixating within
±20° of the centre of one or other cylinder, as shown by the
schematic ant above each distribution. The mean X positions of the two
distributions differ significantly (Student's t-test;
P=0.005, t=2.91, d.f.=72).
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