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Fig. 4. Search distributions for an absent feeder that is normally placed between
two cylinders. A white curtain surrounded the experimental arena. Starting pen
was 45 cm from the feeder. (A) Tests with one small and one large training
cylinder. (B) Tests with two equal-sized cylinders. The darkest area
represents 7.97% of the search in the training condition (N=53 paths)
and 3.99% in the test condition (N=57 paths). The mean X positions of
the two distributions differ significantly (Student's t-test;
P=0.002, t=3.24, d.f.=108) from each other and from the
predicted food sites (Student's t-test; A: P=0.005,
t=2.96, d.f.=52; B: P<0.001, t=10.43,
d.f.=56).
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