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In vivo Imaging of Deep Cortical Layers using a Microprism
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Cortical layer-specific critical dynamics triggering perception.

James H Marshel1, Yoon Seok Kim2, Timothy A Machado1,2

  • 1CNC Department, Stanford University, Stanford, CA 94305, USA.

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Summary
This summary is machine-generated.

Researchers precisely controlled individual neurons in the mouse neocortex using optogenetics. This stimulation drove neuronal networks and successfully elicited visual discrimination behavior, revealing layer-specific cortical dynamics.

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Area of Science:

  • Neuroscience
  • Optogenetics
  • Systems Neuroscience

Background:

  • Neuronal activity patterns in the mammalian neocortex are hypothesized to underlie perceptual experiences.
  • Understanding the causal link between specific neuronal activity and behavior is crucial.

Purpose of the Study:

  • To investigate the role of specific neuronal ensembles in visual discrimination.
  • To explore the causal relationship between optogenetically-evoked neuronal activity and behavior.
  • To characterize layer-specific dynamics within the neocortex during perceptual tasks.

Main Methods:

  • Utilized a novel red-shifted channelrhodopsin (ChRmine) for neuronal control.
  • Employed multiplexed multiphoton-holography (MultiSLM) for precise, large-volume neuronal stimulation.
  • Recorded and analyzed neuronal activity in mouse neocortex during visual discrimination tasks.

Main Results:

  • Stimulating stimulus-orientation-selective neurons recruited functionally related neuronal populations.
  • Optogenetic activation of these ensembles successfully drove correct behavioral discrimination.
  • Observed asymmetric propagation of neuronal activity from layer 2/3 to layer 5, with layer 5 ensembles being highly effective.
  • Evoked population dynamics predicted behavior and mirrored natural visual representations.

Conclusions:

  • Precise optogenetic control of neuronal ensembles can directly elicit specific perceptual behaviors.
  • Neocortical processing exhibits distinct layer-specific dynamics during visual discrimination.
  • Task learning enhances, but is not essential for, the recruitment of neuronal networks by targeted stimulation.