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Can visual capture of sound separate auditory streams?

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Abstract

In noisy contexts, sound discrimination improves when the auditory sources are separated in space. This phenomenon, named Spatial Release from Masking (SRM), arises from the interaction between the auditory information reaching the ear and spatial attention resources. To examine the relative contribution of these two factors, we exploited an audio-visual illusion in a hearing-in-noise task to create conditions in which the initial stimulation to the ears is held constant, while the perceived separation between speech and masker is changed illusorily (visual capture of sound). In two experiments, we asked participants to identify a string of five digits pronounced by a female voice, embedded in either energetic (Experiment 1) or informational (Experiment 2) noise, before reporting the perceived location of the heard digits. Critically, the distance between target digits and masking noise was manipulated both physically (from 22.5 to 75.0 degrees) and illusorily, by pairing target sounds with visual stimuli either at same (audio-visual congruent) or different positions (15 degrees offset, leftward or rightward: audio-visual incongruent). The proportion of correctly reported digits increased with the physical separation between the target and masker, as expected from SRM. However, despite effective visual capture of sounds, performance was not modulated by illusory changes of target sound position. Our results are compatible with a limited role of central factors in the SRM phenomenon, at least in our experimental setting. Moreover, they add to the controversial literature on the limited effects of audio-visual capture in auditory stream separation.

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Valzolgher, C. (2021, March 23). Can visual capture of sound separate auditory streams? Retrieved from osf.io/vj7rg.

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Acknowledgements

The authors are grateful to Dr. Massimo Vescovi for the technical support and two anonymous reviewers for comments on a previous version of the manuscript.

Funding

The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: C. V. was supported by a grant of the Università Italo-Francese/Université Franco-Italienne, the Zegna Founder's Scholarship and Associazione Amici di Claudio Demattè. F. P. was supported by a grant of the Agence Nationale de la Recherche (ANR-16-CE17-0016, VIRTUALHEARING3D, France), by a prize of the Foundation Medisite (France), by the Neurodis Foundation (France) and by a grant from the Italian Ministry for Research and University (MUR, PRIN 20177894ZH).

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Correspondence to Chiara Valzolgher.

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The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

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Communicated by Francesca Frassinetti.

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Valzolgher, C., Giovanelli, E., Sorio, R. et al. Can visual capture of sound separate auditory streams?. Exp Brain Res 240, 813–824 (2022). https://doi.org/10.1007/s00221-021-06281-8

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  • DOI: https://doi.org/10.1007/s00221-021-06281-8

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