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Brain State-Dependent Modulation of Thalamic Visual Processing by Cortico-Thalamic Feedback.

Kimberly Reinhold1,2,3, Arbora Resulaj2,3,4, Massimo Scanziani2,3,4

  • 1Neurosciences Graduate Program, University of California San Diego, La Jolla, 92093, California kimberly_reinhold@hms.harvard.edu.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 18, 2023
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Summary
This summary is machine-generated.

Brain state significantly influences how the brain processes visual information. Cortico-thalamic feedback is crucial for these state-dependent changes in the dorsolateral geniculate nucleus (dLGN) responses to visual stimuli.

Keywords:
behavioral statecortico-thalamic feedbackdLGNmouseprimary visual cortexvisual processing

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Area of Science:

  • Neuroscience
  • Visual Processing
  • Sensory Systems

Background:

  • Mammalian brain state modulates sensory processing, even at early stages like the dorsolateral geniculate nucleus (dLGN).
  • dLGN neurons show altered responses to visual stimuli based on behavioral state (e.g., alert vs. quiescent).
  • The role of visual cortex feedback in these state-dependent dLGN responses remains unclear.

Purpose of the Study:

  • To investigate the contribution of cortico-thalamic feedback to state-dependent visual processing in the dLGN.
  • To determine if feedback influences responses to temporal and spatial visual features.

Main Methods:

  • Utilized male and female mice models.
  • Employed silencing of cortico-thalamic feedback pathways.
  • Recorded neural responses in the dLGN to visual stimuli.

Main Results:

  • Silencing cortico-thalamic feedback significantly diminished state-dependent differences in dLGN neuronal responses.
  • This effect was observed for both temporal and spatial aspects of visual stimuli.
  • Cortico-thalamic feedback is essential for modulating dLGN responses based on brain state.

Conclusions:

  • State-dependent shifts in visual processing at the dLGN rely on feedback from the visual cortex.
  • Cortico-thalamic feedback plays a critical role in integrating behavioral state with early visual information processing.