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Characterizing approach behavior of Drosophila melanogaster in Buridan’s paradigm

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  • Rui Han
  • Tzu-Min Wei
  • Szu-Chiao Tseng
  • Chung-Chuan Lo

Abstract

The Buridan’s paradigm is a behavioral task designed for testing visuomotor responses or phototaxis in fruit fly Drosophila melanogaster. In the task, a wing-shortened fruit fly freely moves on a round platform surrounded by a 360° white screen with two vertical black stripes placed at 0° and 180°. A normal fly will tend to approach the stripes one at a time and move back and forth between them. A variety of tasks developed based on the Buridan’s paradigm were designed to test other cognitive functions such as visual spatial memory. Although the movement patterns and the behavioral preferences of the flies in the Buridan’s or similar tasks have been extensively studies a few decades ago, the protocol and experimental settings are markedly different from what are used today. We revisited the Buridan’s paradigm and systematically investigated the approach behavior of fruit flies under different stimulus settings. While early studies revealed an edge-fixation behavior for a wide stripe in the initial visuomotor responses, we did not discover such tendency in the Buridan’s paradigm when observing a longer-term behavior up to minutes, a memory-task relevant time scale. Instead, we observed robust negative photoaxis in which the flies approached the central part of the dark stripes of all sizes. In addition, we found that stripes of 20°-30° width yielded the best performance of approach. We further varied the luminance of the stripes and the background screen, and discovered that the performance depended on the luminance ratio between the stripes and the screen. Our study provided useful information for designing and optimizing the Buridan’s paradigm and other behavioral tasks that utilize the approach behavior.

Suggested Citation

  • Rui Han & Tzu-Min Wei & Szu-Chiao Tseng & Chung-Chuan Lo, 2021. "Characterizing approach behavior of Drosophila melanogaster in Buridan’s paradigm," PLOS ONE, Public Library of Science, vol. 16(1), pages 1-19, January.
  • Handle: RePEc:plo:pone00:0245990
    DOI: 10.1371/journal.pone.0245990
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    References listed on IDEAS

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    1. Julien Colomb & Lutz Reiter & Jedrzej Blaszkiewicz & Jan Wessnitzer & Bjoern Brembs, 2012. "Open Source Tracking and Analysis of Adult Drosophila Locomotion in Buridan's Paradigm with and without Visual Targets," PLOS ONE, Public Library of Science, vol. 7(8), pages 1-12, August.
    2. Kirsa Neuser & Tilman Triphan & Markus Mronz & Burkhard Poeck & Roland Strauss, 2008. "Analysis of a spatial orientation memory in Drosophila," Nature, Nature, vol. 453(7199), pages 1244-1247, June.
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