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Related Experiment Videos

Hearing loss raises excitability in the auditory cortex.

Vibhakar C Kotak1, Sho Fujisawa, Fanyee Anja Lee

  • 1Center for Neural Science, New York University, New York, New York 10003, USA. kotak@cns.nyu.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|April 15, 2005
PubMed
Summary

Sensorineural hearing loss (SNHL) in developing gerbils alters primary auditory cortex (A1) neurons, increasing excitation and decreasing inhibition. These changes may represent homeostatic mechanisms to maintain cortical function despite deafness.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Developmental Neuroscience

Background:

  • Developmental hearing impairments significantly impact sound discrimination, speech acquisition, and cognitive functions.
  • The functional property adjustments in the primary auditory cortex (A1) following early-life hearing loss are not well understood.

Purpose of the Study:

  • To investigate the intrinsic membrane and synaptic property changes in primary auditory cortex (A1) layer 2/3 pyramidal neurons after induced sensorineural hearing loss (SNHL) during development.
  • To elucidate the compensatory mechanisms within the A1 in response to early-life auditory deprivation.

Main Methods:

  • Sensorineural hearing loss (SNHL) was induced in developing gerbils.
  • Whole-cell recordings were performed on layer 2/3 pyramidal neurons in thalamocortical brain slices.

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  • Electron microscopic immunocytochemistry was used to examine synaptic properties.

    • Main Results:

    • SNHL neurons exhibited a depolarized resting membrane potential, increased input resistance, and sustained firing.
    • Excitatory synaptic responses were significantly larger, with increased NMDA receptor (NMDAR) subunit NR2B involvement.
    • Miniature excitatory postsynaptic currents (mEPSCs) showed decreased frequency and increased amplitude, suggesting compensatory increases in excitation.
    • GABAergic inhibitory synaptic responses were significantly smaller in SNHL neurons.

    Conclusions:

    • Alterations in A1 neuronal properties after developmental deafness involve increased excitatory synaptic transmission and decreased inhibition.
    • These cellular changes likely represent homeostatic mechanisms to maintain cortical excitability levels in the face of SNHL.
    • The findings provide insights into neural plasticity in the auditory cortex following early-life hearing loss.