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Fig. 7. Search density distribution of ants that faced different types of landmark
stimuli. Ants were trained with a black and rough landmark at the nest
entrance (black square) and later tested with a landmark of different
properties defining the nest entrance at 7.5 m (red square, LM-position). Test
2A (shaded area): Control experiment with a black and rough landmark (same
experimental situation as test 1B, but new data set). Test 2B (thin solid
line): a grey and rough landmark deprived the ant of the visual contrast. Test
2C (broken line): a black and smooth landmark changed the surface roughness,
but left the visual contrast intact (as compared to the training situation).
Test 2D (dotted line): the lower hemispheres of the ants' eyes were covered
with lighttight paint depriving the ant from any visual cues from below.
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