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Reduction in sound discrimination in noise is related to envelope similarity and not to a decrease in envelope

Samira Souffi1, Léo Varnet2, Meryem Zaidi1

  • 1Paris-Saclay Institute of Neuroscience (Neuro-PSI, UMR 9197), CNRS - Université Paris-Saclay, Saclay, France.

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Auditory neurons track temporal envelopes for sound discrimination, even in noisy conditions. This envelope tracking mechanism helps the brain distinguish sounds despite acoustic challenges.

Keywords:
auditory systemdegraded acoustic conditionsneuronal and behavioural discriminationtemporal envelope tracking

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Area of Science:

  • Neuroscience
  • Auditory System Research
  • Acoustic Signal Processing

Background:

  • Challenging acoustic environments impair sound detection and discrimination.
  • Temporal envelope tracking's role in degraded acoustic conditions requires clarification.

Purpose of the Study:

  • To investigate the function of temporal envelope tracking in auditory neuronal and behavioral sound discrimination under acoustic degradation.
  • To determine if envelope tracking is a universal mechanism in the central auditory system.

Main Methods:

  • Recorded neuronal activity across multiple auditory system levels (auditory nerve to secondary auditory cortex) in guinea pigs.
  • Utilized a go/no-go sound discrimination task in mice to assess behavioral performance.
  • Examined responses under quiet and acoustically degraded conditions (vocoding, masking noise).

Main Results:

  • Slow temporal envelope tracking is a general property of auditory neurons for encoding sounds in both quiet and noisy environments.
  • Auditory neurons maintain envelope tracking abilities even with significant acoustic degradation (e.g., signal-to-noise ratio of -10 dB).
  • Increased similarity in temporal envelopes of sounds in noisy conditions correlates with reduced neuronal and behavioral discrimination.

Conclusions:

  • Temporal envelope tracking is a fundamental mechanism in the central auditory system for processing communication sounds.
  • This mechanism enables the detection of differences in sound envelopes, facilitating discrimination in degraded acoustic environments.
  • Envelope tracking supports both neural and behavioral sound discrimination when temporal envelope differences are present.