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Related Experiment Video

Updated: Sep 20, 2025

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Dynamic causal communication channels between neocortical areas.

Mitra Javadzadeh1, Sonja B Hofer1

  • 1Sainsbury Wellcome Centre for Neural Circuits and Behaviour, University College London, London, UK.

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|June 11, 2022
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Summary
This summary is machine-generated.

Neural communication between visual cortex areas is dynamic and context-dependent. Fast, shifting interactions influence how the brain processes visual stimuli, especially when rewards are involved.

Keywords:
causal manipulationcommunication subspaceinter-areal communicationneocortical interactionspopulation activity dynamicsvisual cortexvisual processing

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Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Computational Neuroscience

Background:

  • Sensory processing relies on interactions between neocortical regions.
  • The causal influence and temporal dynamics of these interactions are not fully understood.

Purpose of the Study:

  • To investigate the causal influence and temporal dynamics of communication between the primary visual cortex (V1) and higher-order visual area LM.
  • To determine how context, such as reward prediction, affects these neural interactions.

Main Methods:

  • Used momentary silencing of one visual area while recording neural activity in another in mice.
  • Analyzed population activity changes in response to visual stimuli.

Main Results:

  • Both V1 and LM causally influenced subpopulations of target neurons within 100 milliseconds.
  • Feedback from LM to V1 showed dynamic changes, particularly when visual stimuli predicted rewards.
  • Reward context led to rapid alterations in V1 population activity geometry and stimulus coding.

Conclusions:

  • Functional interactions between cortical areas are not static but rapidly shifting.
  • These dynamic communication subspaces are context-dependent, influencing sensory processing.
  • Understanding these rapid, context-driven interactions is crucial for comprehending brain function.