A novel concept for dynamic adjustment of auditory space

Scientific Reports
A LingnerBenedikt Grothe

Abstract

Traditionally, the auditory system is thought to serve reliable sound localization. Stimulus-history driven feedback circuits in the early binaural pathway, however, contradict this canonical concept and raise questions about their functional significance. Here we show that stimulus-history dependent changes in absolute space perception are poorly captured by the traditional labeled-line and hemispheric-difference models of auditory space coding. We therefore developed a new decoding model incorporating recent electrophysiological findings in which sound location is initially computed in both brain hemispheres independently and combined to yield a hemispherically balanced code. This model closely captures the observed absolute localization errors caused by stimulus history, and furthermore predicts a selective dilation and compression of perceptional space. These model predictions are confirmed by improvement and degradation of spatial resolution in human listeners. Thus, dynamic perception of auditory space facilitates focal sound source segregation at the expense of absolute sound localization, questioning existing concepts of spatial hearing.

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Citations

Jul 18, 2020·PLoS Computational Biology·Timo OessHeiko Neumann
Mar 1, 2019·Frontiers in Neural Circuits·Ida SivekeFelix Felmy
Sep 3, 2020·The Journal of the Acoustical Society of America·Travis M MooreG Christopher Stecker
Feb 4, 2021·Journal of Neurophysiology·Jakob Christensen-DalsgaardCatherine E Carr

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