Detection of Tones Masked by Fluctuating Noise in Rat Auditory Cortex

Itai Hershenhoren, Israel Nelken*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Sounds in natural settings always appear over a noisy background. The masked threshold of a pure tone in white noise (the lowest sound level at which the tone can be detected in the presence of masking noise) is largely determined by energy masking in the peripheral auditory system: when the signal-to-noise ratio within a frequency band centered at the target tone frequency is large enough, the tone can be detected. However, when additional information is supplied to the auditory system, for example in the presence of slow and coherent modulations of a broadband masker (often found in natural sounds), masked thresholds can be reduced substantially below the values expected from pure energy masking. Here, we used intracellular recordings in vivo in rat auditory cortex in order to study neuronal responses to pure tones masked by broadband maskers and amplitude-modulated broadband maskers. When tones were embedded in amplitude-modulated noise, detection thresholds were substantially lower than when embedded in unmodulated noise. The main cue for tone detection in modulated noise consisted of the suppression of the locking of the neuronal responses to the amplitude modulation of the noise by low-level tones.

Original languageAmerican English
Pages (from-to)5130-5143
Number of pages14
JournalCerebral Cortex
Volume27
Issue number11
DOIs
StatePublished - 1 Nov 2017

Bibliographical note

Publisher Copyright:
© The Author 2016. Published by Oxford University Press. All rights reserved.

Keywords

  • comodulation masking release
  • electrophysiology
  • membrane potential
  • neuron

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