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. 2018 Jun 6;8:8670. doi: 10.1038/s41598-018-26834-2

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© The Author(s) 2018

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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Experimental design of double-sound paradigm. (A) Speaker locations in the midsagittal plane ranged from −45 deg to +45 deg elevation, in steps of 5 deg, yielding 66 different double-speaker combinations. In the example, the leading sound (1) is presented at +35 deg, the lagging sound (2) at −15 deg (spatial disparity of 50 deg). (B) The listener initiated a trial by pressing a button after having aligned a head-mounted laser pointer with a straight-ahead fixation LED. The LED switched off 200 ms later. After a 200 ms gap, the leading sound turned on for 100 ms. The lagging sound followed with a varying delay. The subject had to make a rapid goal-directed head movement towards the perceived leading sound.