Abstract
subplates, 30 cm in diameter, which were inserted in the larger round plate. The three subplates could be rotated independently. Each of the 12 sites was equipped with a microphone and a reference microphone (24 in total). The microphones were used for automatic detection of the approach flight of a bee during the test procedure: they had frequency thresholds adjusted to detect the bees' flight and intensity thresholds such that choices were recorded from a flight distance of 5 cm. The signals of the microphones were A/D converted and monitored by a computer that automatically stored the bees' choices at a resolution of 11 ms. The stimuli were placed on the microphone capsules and five thin perforations were made in the center of the cardboard forms to record the bees' choices.
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