Temporal coherence and the streaming of complex sounds

Shihab Shamma, Mounya Elhilali, Ling Ma, Christophe Micheyl, Andrew J. Oxenham, Daniel Pressnitzer, Pingbo Yin, Yanbo Xu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

18 Scopus citations

Abstract

Humans and other animals can attend to one of multiple sounds, and follow it selectively over time. The neural underpinnings of this perceptual feat remain mysterious. Some studies have concluded that sounds are heard as separate streams when they activate well-separated populations of central auditory neurons, and that this process is largely pre-attentive. Here, we propose instead that stream formation depends primarily on temporal coherence between responses that encode various features of a sound source. Furthermore, we postulate that only when attention is directed toward a particular feature (e.g., pitch or location) do all other temporally coherent features of that source (e.g., timbre and location) become bound together as a stream that is segregated from the incoherent features of other sources. Experimental neurophysiological evidence in support of this hypothesis will be presented. The focus, however, will be on a computational realization of this idea and a discussion of the insights learned from simulations to disentangle complex sound sources such as speech and music. The model consists of a representational stage of early and cortical auditory processing that creates a multidimensional depiction of various sound attributes such as pitch, location, and spectral resolution. The following stage computes a coherence matrix that summarizes the pair-wise correlations between all channels making up the cortical representation. Finally, the perceived segregated streams are extracted by decomposing the coherence matrix into its uncorrelated components. Questions raised by the model are discussed, especially on the role of attention in streaming and the search for further neural correlates of streaming percepts.

Original languageEnglish (US)
Title of host publicationBasic Aspects of Hearing
Subtitle of host publicationPhysiology and Perception
Pages535-543
Number of pages9
DOIs
StatePublished - Oct 2 2013

Publication series

NameAdvances in Experimental Medicine and Biology
Volume787
ISSN (Print)0065-2598

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    Shamma, S., Elhilali, M., Ma, L., Micheyl, C., Oxenham, A. J., Pressnitzer, D., Yin, P., & Xu, Y. (2013). Temporal coherence and the streaming of complex sounds. In Basic Aspects of Hearing: Physiology and Perception (pp. 535-543). (Advances in Experimental Medicine and Biology; Vol. 787). https://doi.org/10.1007/978-1-4614-1590-9-59