Visuomotor learning promotes visually evoked activity in the medial prefrontal cortex

Area of Science:

• Neuroscience
• Cognitive Science
• Motor Learning

Background:

• The medial prefrontal cortex (mPFC) plays a crucial role in learned associations between stimuli and movements.
• Understanding the dynamic changes in mPFC activity during learning and its correlation with sensory input and motor output remains an open question.

Purpose of the Study:

• To investigate how medial prefrontal cortex (mPFC) activity evolves during the learning of a visuomotor association.
• To determine the correlation between mPFC activity, sensory stimuli, and evoked movements throughout the learning process.

Main Methods:

• Widefield calcium imaging was employed to record cortical activity in mice during the learning of a visual stimulus-forelimb movement association.
• Electrophysiological recordings were used to pinpoint the specific brain regions within the mPFC responsible for the observed activity.

Main Results:

• Post-learning, the mPFC exhibited stimulus-evoked activity during both task execution and passive stimulus viewing.
• This stimulus-evoked activity demonstrated a strong correlation with behavioral performance, increasing significantly during initial learning and steadily thereafter.
• Activity was localized to the secondary motor cortex and anterior cingulate cortex.

Conclusions:

• Learning a visuomotor task establishes a pathway for visual information to access the medial prefrontal cortex (mPFC).
• The findings suggest that mPFC activity dynamically adapts during learning, reflecting the strengthening of stimulus-response associations.