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. 2017 Nov 9;7:15158. doi: 10.1038/s41598-017-15276-x

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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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Auditory effects of different frequencies of tones on turn movement in wind-elicited escape. (a) Histograms of turn magnitude for three types of stimulation in 7.5-degree bins. Upper right inset indicates a definition of turn magnitude. The turn magnitude was measured as an absolute angular value of turn regardless of the rotational direction. (b,c) Mean and standard deviation of turn magnitude among the three types of stimulation. (d) Correlations between walking direction and turn magnitude for the tone-free (r = 0.3729, p < 0.0001), 5-kHz tone (r = 0.3787, p < 0.0001), and 15-kHz tone (r = 0.3273, p < 0.0001) stimulations. Unlike the aligned walking direction shown in Fig. 3, the walking direction was measured as an absolute value in which forward and backward walks resulted in 0º and 180º, respectively. **p < 0.01, (paired t-test followed by Holm’s correction). (e) Correlations between walking direction and standard deviation of turn magnitude calculated in 6 bins equally-spaced per 30º (0º–30º, 30º–60º, 60º–90º, 90º–120º, 120º–150º, and 150º–180º). The standard deviation was positively correlated with walking direction in all types of stimulation (for tone-free, r = 0.9442, p = 0.0046; for 5-kHz tone, r = 0.9282, p = 0.0075; for 15-kHz tone, r = 0.9584, p = 0.0026).