Cortical Localization of the Sensory-Motor Transformation in a Whisker Detection Task in Mice

Area of Science:

• Neuroscience
• Sensory-motor systems
• Cortical processing

Background:

• The neural basis of sensory-motor transformation, converting sensory input into motor output, remains debated.
• Key brain regions like primary somatosensory cortex (S1), whisker motor cortex (wMC), and anterior lateral motor cortex (ALM) are implicated.

Purpose of the Study:

• To investigate the roles of S1, wMC, and ALM in sensory-motor transformation during a whisker detection task.
• To identify the specific cortical region responsible for transforming sensory information into motor commands.

Main Methods:

• Single unit recordings were performed in male and female mice trained on a whisker deflection go/no-go task.
• Neural activity was analyzed for sensory, motor, and choice-related encoding in S1, wMC, and ALM.

Main Results:

• S1 and wMC exhibited strong sensory encoding, with wMC showing enhanced representation.
• Motor encoding was prominent in all three regions, particularly in wMC and ALM.
• wMC displayed the earliest choice probability, suggesting its role in decision-making.

Conclusions:

• The whisker motor cortex (wMC) is identified as the primary site for sensory-motor transformation.
• A model is proposed where S1 handles initial sensory encoding, wMC performs amplification and transformation, and ALM generates motor commands.