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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

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 the...

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Phase de-synchronization effects auditory gating in the ventral striatum but not auditory cortex.

M L Woldeit1, A L Schulz, F W Ohl

  • 1Leibniz Institute for Neurobiology, Systems Physiology of Learning, Magdeburg, Germany. Marie.Woldeit@lin-magdeburg.de

Neuroscience
|May 3, 2012
PubMed
Summary

Auditory gating, the brain

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Mapping the After-effects of Theta Burst Stimulation on the Human Auditory Cortex with Functional Imaging

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Area of Science:

  • Neuroscience
  • Auditory Processing
  • Sensory Gating

Background:

  • Mechanisms of sensory gating for repetitive auditory stimuli are not fully understood.
  • The role of the auditory cortex and temporal precision in auditory gating is debated.

Purpose of the Study:

  • To investigate auditory gating dynamics in the primary auditory cortex and ventral striatum.
  • To assess the influence of the auditory cortex on sensory gating.
  • To test the hypothesis that auditory gating involves phase de-synchronization.

Main Methods:

  • Recorded local field potentials in Mongolian gerbils' auditory cortex and ventral striatum.
  • Stimulated with trains of frequency-modulated tones.
  • Analyzed gating via amplitude ratios, time-frequency analysis, and between-area phase coupling.

Main Results:

  • Auditory gating was over 50% stronger in the ventral striatum than in the auditory cortex.
  • Energy in the striatum was mainly non-phase-locked, while auditory cortex energy remained phase-locked.
  • Observed between-area phase unlocking during sound presentation.

Conclusions:

  • Phase de-synchronization in the ventral striatum is a likely mechanism for auditory gating.
  • Direct inhibitory suppression by the auditory cortex plays a minimal role in this gating process.