Interactions between egocentric and allocentric spatial coding of sounds revealed by a multisensory learning paradigm

Although sound position is initially head-centred (egocentric coordinates), our brain can also represent sounds relative to one another (allocentric coordinates). Whether reference frames for spatial hearing are independent or interact remained largely unexplored. Here we developed a new allocentric...

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Vydáno v:	Scientific reports Ročník 9; číslo 1; s. 7892
Hlavní autoři:	Rabini, Giuseppe, Altobelli, Elena, Pavani, Francesco
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	London Nature Publishing Group UK 27.05.2019 Nature Publishing Group
Témata:	631/378/2649/1723 631/477/2811 Acoustic Stimulation - instrumentation Acoustic Stimulation - methods Adult Ear Female Hearing Hearing - physiology Humanities and Social Sciences Humans Learning Localization Male multidisciplinary Neural coding Photic Stimulation - instrumentation Photic Stimulation - methods Protective equipment Science Science (multidisciplinary) Sound Sound Localization - physiology Space Perception Spatial Learning - physiology Training Visual perception Visual Perception - physiology Young Adult
ISSN:	2045-2322, 2045-2322
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Shrnutí:	Although sound position is initially head-centred (egocentric coordinates), our brain can also represent sounds relative to one another (allocentric coordinates). Whether reference frames for spatial hearing are independent or interact remained largely unexplored. Here we developed a new allocentric spatial-hearing training and tested whether it can improve egocentric sound-localisation performance in normal-hearing adults listening with one ear plugged. Two groups of participants (N = 15 each) performed an egocentric sound-localisation task (point to a syllable), in monaural listening, before and after 4-days of multisensory training on triplets of white-noise bursts paired with occasional visual feedback. Critically, one group performed an allocentric task (auditory bisection task), whereas the other processed the same stimuli to perform an egocentric task (pointing to a designated sound of the triplet). Unlike most previous works, we tested also a no training group (N = 15). Egocentric sound-localisation abilities in the horizontal plane improved for all groups in the space ipsilateral to the ear-plug. This unexpected finding highlights the importance of including a no training group when studying sound localisation re-learning. Yet, performance changes were qualitatively different in trained compared to untrained participants, providing initial evidence that allocentric and multisensory procedures may prove useful when aiming to promote sound localisation re-learning.
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23 ObjectType-Undefined-3
ISSN:	2045-2322 2045-2322
DOI:	10.1038/s41598-019-44267-3