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Journal of Experimental Biology, Vol 203, Issue 21 3289-3298, Copyright © 2000 by Company of Biologists

JOURNAL ARTICLES

Detection of bright and dim colours by honeybees

N Hempel De Ibarra, M Vorobyev, R Brandt and M Giurfa
Institut fur Biologie - Neurobiologie, Freie Universitat Berlin, Konigin-Luise-Strasse 28/30, D-14195 Berlin, Germany. nhempel@neurobiologie.fu-berlin.de

Honeybees, Apis mellifera, were trained to detect coloured disks with either a strong or a weak intensity difference against the background. Green, blue, ultraviolet-reflecting white and grey papers were reciprocally combined as targets or backgrounds, providing strong chromatic and/or achromatic cues. The behavioural performance of the honeybees was always symmetrical for both reciprocal target/background combinations of a colour pair, thus showing that target detection is independent of whether the colour is presented as a background or as a target in combination with the other colour. Bright targets against dim backgrounds and vice versa were detected more reliably than dim target/background combinations. This result favours the general assumption that the detectability of a coloured stimulus increases with increasing intensity.


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