Bumblebees (Bombus terrestris) sacrifice foraging speed to solve difficult colour discrimination tasks
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The performance of individual bumblebees at colour discrimination tasks was tested in a controlled laboratory environment. Bees were trained to discriminate between rewarded target colours and differently coloured distractors, and then tested in non-rewarded foraging bouts. For the discrimination of large colour distances bees made relatively fast decisions and selected target colours with a high degree of accuracy, but for the discrimination of smaller colour distances the accuracy decreased and the bees response times to find correct flowers significantly increased. For small colour distances there was also significant linear correlations between accuracy and response time for the individual bees. The results show both between task and within task speed-accuracy tradeoffs in bees, which suggests the possibility of a sophisticated and dynamic decision-making process.
KeywordsColour vision Flower learning Insect vision Response time Speed-accuracy tradeoff
We thank Professor W.R.A. Muntz, Dr. L.L. Muir and two anonymous referees for their comments on the manuscript. A.G. Dyer is grateful for support from the Alexander von Humboldt Foundation.
- Chittka L (1992) The colour hexagon: a chromaticity diagram based on photoreceptor excitations as a generalized representation of colour opponency. J Comp Physiol A 170:533–543Google Scholar
- Chittka L, Gumbert A, Kunze J (1997) Foraging dynamics of bumble bees: correlates of movements within and between plant species. Behav Ecol 8: 239–249Google Scholar
- Giurfa M, Núnez J, Chittka L, Menzel R (1995) Colour preferences of flower-naive honeybees. J Comp Physiol A 177:247–259Google Scholar
- Menzel R, Backhaus W (1991) Colour vision in insects. In: Gouras P (ed) Vision and visual dysfunction, vol 6, The perception of colour. Macmillan Press, London, pp 262–293Google Scholar
- Pachella RG (1974) The interpretation of reaction time in information-processing research. In: Kantowitz B (ed) Human information processing: tutotial in performance and recognition. Erlbaum, Hillsdale, NJ, pp 41–82Google Scholar
- Zenger B, Fahle M (1997) Missed targets are more frequent than false alarms: a model for error rates in visual search. J Exp Psychol 23:1783–1791Google Scholar