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. 2019 May 27;9:7892. doi: 10.1038/s41598-019-44267-3

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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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Apparatus, overall experimental procedure and tasks. (A) Participants sat in front of a matrix (5 × 12) of loudspeakers mounted on a rectangular panel, on which visual stimuli were projected when appropriate. Response were collected through mouse cursor or keyboard. (B) The experiment lasted five consecutive days, with testing sessions at day 1, day 3 and day 5, and training sessions from day 2 to day 5. (C) During testing sessions, participants completed an egocentric sound localisation task. In each trial, a spoken Italian syllable was presented from one speaker of the stimulation matrix and participants indicated the source of the sound by left-clicking with the mouse cursor in the correspondent position. (D) The AlloT Group performed the acoustic space bisection task. Three consecutive sounds (white noise) were presented at different horizontal positions and participants indicated if the second sound was closer to the first or third presented sound. During audio-visual trials (75% of total) a white dot appeared on screen to mark the exact position of each sound, together with lines connecting the dots to depict the spatial relationships between sounds. (E) The EgoT group received exactly the same audio-visual stimulation (with the only exception of lines connecting the dots) but was instructed to localise only one of the three presented sounds using the mouse.