January 21, 2021

Divergent sensory processing converges in frontal cortex for a planned motor response

Purposeful behavior requires planning of actions based on external information. However, neuronal mechanisms converting sensory input into a motor plan remain elusive. Here, we combined wide-field calcium imaging, multi-area single-neuron recordings and focal optogenetic inactivation to reveal the precise sequence of cortical activity transforming sensory information into motor planning in mice trained to respond to a brief whisker stimulus by licking after a delay. We found that upon learning, the sensory information, initially highly-localized, rapidly spreads to diverse motor and higher-order areas, together with transient deactivation of orofacial regions, converging during the delay period to a focalized region of the frontal cortex. The secondary whisker motor cortex (wM2) appears as a key relay of this sensorimotor transformation, showing the earliest learning-enhanced response to the whisker stimulus. Our results suggest a specific cortical circuit with wM2 acquiring a pivotal role in transforming whisker information into preparatory activity for goal-directed motor planning.

 bioRxiv Subject Collection: Neuroscience

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