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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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Processing of auditory localisation cues takes place at very different time scales for azimuth (grey) and elevation (black; cf. with Fig. 1). Although the location of the leading sound is available to the system after ~25–30 ms (black arrow, and dark-grey bar after T₁ off), the lagging sound (here at ~140 ms) interferes with this process, even long after the leading sound’s offset. The grey patch between the alleged precedence effect (PE) for elevation, and the measured results indicates the strength of ‘backward masking’ (‘BM’).