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Fig. 5. Approaches to an absent feeder (A,C) and search distributions between the
two cylinders (B,D). The curtain on one side of the arena is patterned.
Starting pen was 45 cm from the feeder. (A,B) Tests with small and large
training cylinders. (C,D) Tests with two medium-sized cylinders. The darkest
area represents 5.79% of the search in the training condition (N=61
paths) and 6.36% in the test condition (N=91 paths). The mean X
positions of the two distributions differ significantly (Student's
t-test; P<0.001, t=5.14, d.f.=150). Because of
the long tail of the distribution, the mean X position of the distribution in
D differs significantly from the predicted food site (Student's
t-test; P<0.001, t=12.80, d.f.=90), while the
mean X position of the distribution in B does not differ from the predicted
food site (Student's t-test; P=0.324, t=0.99,
d.f.=60). Distribution in D differs significantly from the distribution of
Fig. 3B (Student's
t-test; P=0.03, t=2.194, d.f.=146).
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