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Optimizing optogenetic stimulation protocols in auditory corticofugal neurons based on closed-loop spike feedback.

Charles-Henri Vila1,2, Ross S Williamson1,3, Kenneth E Hancock1,3

  • 1Eaton-Peabody Laboratories, Massachusetts Eye and Ear Infirmary, Boston, MA 02114 United States of America.

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Summary

Optogenetics allows researchers to precisely control neural activity. This study used an evolutionary search to find optimal stimulation patterns, revealing that how auditory cortex neurons are activated significantly impacts downstream brain regions like the inferior colliculus.

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Area of Science:

  • Neuroscience
  • Optogenetics
  • Auditory System

Background:

  • Optogenetics enables probing functional brain connections by activating specific neurons and recording downstream activity.
  • Understanding feedforward connections requires precise control over presynaptic stimulation patterns.
  • Auditory cortex (ACtx) projections heavily influence the auditory midbrain (IC), but the impact of different activation modes is unclear.

Purpose of the Study:

  • To investigate if varying modes of auditory cortex (ACtx) activation can modulate the strength of feedforward connections to the inferior colliculus (IC).
  • To determine how different temporal activation patterns of ACtx neurons affect sound processing in the IC.

Main Methods:

  • Utilized multi-channel electrophysiology and optogenetics in awake mice to record IC activity.
  • Employed an ultra-fast channelrhodopsin (Chronos) to stimulate ACtx neurons.
  • Implemented a closed-loop evolutionary optimization procedure using real-time IC firing rate feedback to tailor laser stimulation patterns.

Main Results:

  • The evolutionary search rapidly identified ACtx stimulation patterns that enhanced IC unit activity more effectively than generic parameters.
  • Cortical modulation of IC spiking was bidirectional, with the search procedure finding patterns that either suppressed or enhanced sound-evoked firing.
  • Optimization achieved more widespread and potent modulation of IC activity within minutes.

Conclusions:

  • Introduced a novel closed-loop optimization method for investigating functional brain connectivity.
  • Demonstrated that the impact of descending cortical projections on subcortical sensory processing is highly dependent on the temporal activation patterns of cortical neurons.
  • Findings highlight the importance of activation timing in shaping neural circuit function.