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. 2019 Feb 20;9:2416. doi: 10.1038/s41598-019-38791-5

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© The Author(s) 2019

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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Summary. During the acclimatization period (a) C. intestinalis larvae exhibited sensory arousal which translated to higher speeds and increased path complexity. The presence of conspecifics in the arena (b) resulted in reduced locomotor activity, reduced path complexity and a change in the distribution of behavioural modes. We tested the robustness of behaviour in the context of rearing temperature (c) and dechorionation (d) treatments. Finally, the anxiotropic drug Modafinil (e) was able to modulate thigmotaxis, speed and the overall state of animal activity by changing the distribution of the behavioural modes.