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A prefrontal motor circuit initiates persistent movement.

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Dorsal medial prefrontal cortex (dmPFC) motor cortex projecting (MP) neurons initiate persistent movement by encoding contextual cues. Inactivating these neurons impairs movement initiation, revealing a key neural mechanism.

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Computational Neuroscience

Background:

  • Persistent movement is crucial for animal survival and adaptation.
  • The neural mechanisms underlying the initiation of persistent actions remain poorly understood.
  • Identifying brain regions that select information to guide persistent actions is essential.

Purpose of the Study:

  • To investigate the role of dorsal medial prefrontal cortex (dmPFC) motor cortex projecting (MP) neurons in initiating persistent movement.
  • To determine whether dmPFC MP neurons encode contextual information or natural valence during action initiation.
  • To elucidate the neural circuit and computational basis for persistent movement initiation.

Main Methods:

  • Single-unit extracellular recordings in awake mice.
  • Opto-tagging to identify specific neuronal populations.
  • Inactivation of dmPFC MP neurons.
  • Computational modeling of sensory stimulus input.

Main Results:

  • A specific population of dmPFC MP neurons was identified as initiating persistent movement.
  • These neurons selectively encode contextual information, not natural valence.
  • Inactivation of dmPFC MP neurons impaired movement initiation and reduced activity in downstream areas (insular and motor cortex).
  • dmPFC MP neurons are not required for maintaining ongoing persistent movement.

Conclusions:

  • dmPFC MP neurons play a critical role in initiating, but not maintaining, persistent movement.
  • Contextual information processing by dmPFC MP neurons drives action initiation.
  • Successive sensory stimuli serve as input signals for dmPFC MP neurons to initiate persistent actions, revealing a novel neural initiation mechanism.