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. 2017 Sep 5;7:10415. doi: 10.1038/s41598-017-09142-z

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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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ERP scalp map in the (50–90 ms) time window averaged across subjects. Two strong positivities emerged. One, involving central areas, was not modulated by experimental manipulation. The other, involving parieto-occipital areas, showed a specific contralaterality during the space bisection task (a) when a narrow (Left) or a wide (Right) first interval respectively corresponded to a second sound in the left or in the right hemifield. During the time bisection task (b), neither a short nor a long first interval in the time domain could elicit a similar response. The observed contralateral response was specific to the second sound, while absent after the first one. Importantly, no other scalp areas were involved in early positivity.