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  Single neurons in the avian auditory cortex encode individual identity and propagation distance in naturally degraded communication calls

Mouterde, S. C., Elie, J. E., Mathevon, N., & Theunissen, F. E. (2017). Single neurons in the avian auditory cortex encode individual identity and propagation distance in naturally degraded communication calls. The Journal of Neuroscience, 37(13), 3491-3510. doi:10.1523/jneurosci.2220-16.2017.

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Mouterde, S. C., Author
Elie, J. E., Author
Mathevon, N., Author
Theunissen, Frederic E.1, Author           
1University Berkeley, USA, ou_persistent22              


Free keywords: Acoustic Stimulation/methods Action Potentials/*physiology *Animal Communication Animals Auditory Cortex/*physiology Female Finches/*physiology Male Sensory Receptor Cells/*physiology *Social Identification Socialization *auditory scene analysis *electrophysiology *ranging *songbird *sound propagation *vocal communication
 Abstract: One of the most complex tasks performed by sensory systems is "scene analysis": the interpretation of complex signals as behaviorally relevant objects. The study of this problem, universal to species and sensory modalities, is particularly challenging in audition, where sounds from various sources and localizations, degraded by propagation through the environment, sum to form a single acoustical signal. Here we investigated in a songbird model, the zebra finch, the neural substrate for ranging and identifying a single source. We relied on ecologically and behaviorally relevant stimuli, contact calls, to investigate the neural discrimination of individual vocal signature as well as sound source distance when calls have been degraded through propagation in a natural environment. Performing electrophysiological recordings in anesthetized birds, we found neurons in the auditory forebrain that discriminate individual vocal signatures despite long-range degradation, as well as neurons discriminating propagation distance, with varying degrees of multiplexing between both information types. Moreover, the neural discrimination performance of individual identity was not affected by propagation-induced degradation beyond what was induced by the decreased intensity. For the first time, neurons with distance-invariant identity discrimination properties as well as distance-discriminant neurons are revealed in the avian auditory cortex. Because these neurons were recorded in animals that had prior experience neither with the vocalizers of the stimuli nor with long-range propagation of calls, we suggest that this neural population is part of a general-purpose system for vocalizer discrimination and ranging.SIGNIFICANCE STATEMENT Understanding how the brain makes sense of the multitude of stimuli that it continually receives in natural conditions is a challenge for scientists. Here we provide a new understanding of how the auditory system extracts behaviorally relevant information, the vocalizer identity and its distance to the listener, from acoustic signals that have been degraded by long-range propagation in natural conditions. We show, for the first time, that single neurons, in the auditory cortex of zebra finches, are capable of discriminating the individual identity and sound source distance in conspecific communication calls. The discrimination of identity in propagated calls relies on a neural coding that is robust to intensity changes, signals' quality, and decreases in the signal-to-noise ratio.


Language(s): eng - English
 Dates: 2017-03-29
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: Other: 28235893
DOI: 10.1523/jneurosci.2220-16.2017
 Degree: -



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Title: The Journal of Neuroscience
  Other : J. Neurosci.
Source Genre: Journal
Publ. Info: Baltimore, MD : The Society
Pages: - Volume / Issue: 37 (13) Sequence Number: - Start / End Page: 3491 - 3510 Identifier: ISSN: 0270-6474
CoNE: https://pure.mpg.de/cone/journals/resource/954925502187