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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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Local field potentials are local events in the mouse auditory cortex.

Xiuping Liu1, Linran Zhou1, Fangchao Ding1

  • 1Department of Physiology and Pharmacology, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada.

The European Journal of Neuroscience
|June 27, 2015
PubMed
Summary

Local field potentials (LFPs) and spikes (SPKs) reveal local cortical processing. Differences between LFP-constructed receptive fields (RFLFP) and SPK-constructed receptive fields (RFSPK) stem from intracortical networks, not distant signals.

Keywords:
auditory cortexlocal field potentialmouseneuronal receptive fieldspikesystems neuroscience

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Area of Science:

  • Neuroscience
  • Auditory Cortex Research
  • Computational Neuroscience

Background:

  • Local field potentials (LFPs) and spikes (SPKs) at thalamocortical layers reflect neural input and output.
  • Previous studies suggest larger LFP-constructed receptive fields (RFLFP) than spike-constructed receptive fields (RFSPK) due to remote signal contamination.

Purpose of the Study:

  • Investigate the discrepancy between RFLFP and RFSPK in the mouse primary auditory cortex.
  • Determine if volume conduction from distant sites influences cortical LFPs.
  • Clarify the role of local intracortical processing in shaping receptive fields.

Main Methods:

  • Recorded LFPs and SPKs in the mouse primary auditory cortex.
  • Constructed and compared RFSPK and RFLFP.
  • Administered muscimol (inhibition) and bicuculline (disinhibition) to assess cortical LFP locality.

Main Results:

  • RFSPK and RFLFP showed similar best frequencies and minimum thresholds.
  • RFLFP area was only slightly larger than RFSPK area, contrary to prior reports.
  • RFLFP bandwidth was slightly broader than RFSPK bandwidth.
  • Cortical inhibition/disinhibition experiments supported LFP locality.

Conclusions:

  • The observed differences between RFSPK and RFLFP are attributed to intracortical processing, such as lateral inhibition and excitation.
  • Data do not support volume conduction from distant sites as a primary cause for RFLFP characteristics.
  • Cortical LFPs primarily represent local neural events.