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. 2017 Aug 23;7:9231. doi: 10.1038/s41598-017-09112-5

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(A) Step 0: E ^Top → R ^Top; Steps i&ii: E ^Top Trajectories of honeybees (n = 22) trained to enter the tunnel via the upper entrance before being released at the upper entrance under low-roof conditions, as described in i as well as under “dorsal ditch” conditions, as described in ii. In the flight under “dorsal ditch” conditions which the bees had not previously experienced, the insects flew upward and followed the newly encountered high roof at median distances D ^d (see boxplots in iii and iv) which were not significantly different. Distributions of median speed v _x and median dorsal optic flows ω ^d (see boxplots in v and vi) were also not significantly different each others. (B) Step 0: E _Bottom → R _Bottom; Steps i&ii: E _Bottom. Trajectories of honeybees (n = 24) trained to enter the tunnel via the lower entrance before being released at the lower entrance under low-roof conditions, as described in i and again via the lower entrance under “dorsal ditch” conditions, as described in ii. In the flight under “dorsal ditch” conditions which the bees had not previously experienced, the insects flew near the floor at median distances D _v (see boxplots in iii and iv) which were not significantly different. Distributions of median speed v _x and median ventral optic flow ω _v (see boxplots in v and vi) were also not significantly different each others. (See statistics in results and discussion sections).