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Multiscale mapping of frequency sweep rate in mouse auditory cortex.

John B Issa1, Benjamin D Haeffele1, Eric D Young2

  • 1Department of Biomedical Engineering, The Johns Hopkins University School of Medicine, Ross Building, Room 713, 720 Rutland Avenue, Baltimore, MD 21205, USA.

Hearing Research
|December 25, 2016
PubMed
Summary

Researchers discovered a new functional organization in the mouse auditory cortex. This organization is based on the rate of frequency modulated (FM) sweeps, complementing the known organization by sound frequency.

Keywords:
Auditory cortexCortical organizationFrequency modulated sweepsIn vivo two-photon calcium imaging

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Sensory Processing

Background:

  • The neocortex exhibits functional organization crucial for sensory processing, development, and plasticity.
  • Tonotopy, based on cochlear transduction, is the primary organizational feature studied in the auditory cortex.
  • Processing complex sounds necessitates specialization for higher-order features beyond simple frequency mapping.

Purpose of the Study:

  • To uncover functional organization across the auditory cortex for the rate of frequency modulated (FM) sweeps.
  • To investigate neural responses to complex sounds, specifically FM sweeps, in the mouse auditory cortex.
  • To identify specialized neural populations processing specific acoustic features relevant to natural vocalizations.

Main Methods:

  • Utilized a multiscale imaging approach.
  • Employed two-photon calcium (Ca2+) imaging of layer 2/3 neurons.
  • Recorded neural activity in response to tones, bandlimited noise, and FM sweeps.

Main Results:

  • Identified a tone-insensitive region at the border of the primary auditory cortex (AI) and anterior auditory field (AAF).
  • This central sweep region preferentially responded to fast FM sweeps.
  • Neurons in this region showed distinct responses compared to nearby neurons in AI and AII, not responding to tones or noise.

Conclusions:

  • Defined a novel functional organization in the mouse auditory cortex based on sweep rate.
  • This organization is complementary to the established tonotopic (frequency-based) organization.
  • Revealed specialized neural circuits for processing temporal dynamics of sound crucial for complex acoustic signals.