Robust Neuronal Discrimination in Primary Auditory Cortex Despite Degradations of Spectro-temporal Acoustic Details: Comparison Between Guinea Pigs with Normal Hearing and Mild Age-Related Hearing Loss

  • Yonane Aushana
  • Samira Souffi
  • Jean-Marc Edeline
  • Christian Lorenzi
  • Chloé Huetz
Research Article
  • 103 Downloads

Abstract

This study investigated to which extent the primary auditory cortex of young normal-hearing and mild hearing-impaired aged animals is able to maintain invariant representation of critical temporal-modulation features when sounds are submitted to degradations of fine spectro-temporal acoustic details. This was achieved by recording ensemble of cortical responses to conspecific vocalizations in guinea pigs with either normal hearing or mild age-related sensorineural hearing loss. The vocalizations were degraded using a tone vocoder. The neuronal responses and their discrimination capacities (estimated by mutual information) were analyzed at single recording and population levels. For normal-hearing animals, the neuronal responses decreased as a function of the number of the vocoder frequency bands, so did their discriminative capacities at the single recording level. However, small neuronal populations were found to be robust to the degradations induced by the vocoder. Similar robustness was obtained when broadband noise was added to exacerbate further the spectro-temporal distortions produced by the vocoder. A comparable pattern of robustness to degradations in fine spectro-temporal details was found for hearing-impaired animals. However, the latter showed an overall decrease in neuronal discrimination capacities between vocalizations in noisy conditions. Consistent with previous studies, these results demonstrate that the primary auditory cortex maintains robust neural representation of temporal envelope features for communication sounds under a large range of spectro-temporal degradations.

Keywords

vocoder envelope fine structure electrophysiology auditory cortex neural discrimination performance spike timing 

Notes

Acknowledgements

Special thanks to Fabien Lhericel and Céline Dubois for taking care of the guinea pig colony and to Dr. Grégoire Levasseur for helping generating high quality figures.

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Copyright information

© Association for Research in Otolaryngology 2018

Authors and Affiliations

  • Yonane Aushana
    • 1
    • 2
    • 3
  • Samira Souffi
    • 1
    • 2
    • 3
  • Jean-Marc Edeline
    • 1
    • 2
    • 3
  • Christian Lorenzi
    • 4
  • Chloé Huetz
    • 1
    • 2
    • 3
  1. 1.Paris-Saclay Institute of Neurosciences (Neuro-PSI), CNRS UMR 9197OrsayFrance
  2. 2.Université Paris-SudOrsay cedexFrance
  3. 3.Université Paris-SaclayOrsay cedexFrance
  4. 4.Laboratoire des Systèmes Perceptifs, UMR CNRS 8248, Département d’Etudes Cognitives, Ecole Normale Supérieure (ENS)Paris Sciences & Lettres Research UniversityParisFrance

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