Increased Self-Grooming Gates Adult Visual Cortical Plasticity through a Ventral Pallidum-Visual Cortex Pathway

Area of Science:

• Neuroscience
• Behavioral Neuroscience
• Systems Neuroscience

Background:

• Repetitive behaviors are characteristic of neurodevelopmental and psychiatric disorders.
• These behaviors often coincide with visual processing abnormalities.
• The neural mechanisms linking behavioral states to visual system regulation are not well understood.

Purpose of the Study:

• To investigate whether repetitive behavioral states actively regulate the visual system.
• To identify the neural circuits involved in this regulation.
• To explore the link between grooming behavior and visual cortical plasticity.

Main Methods:

• Used a water-spray paradigm to induce self-grooming in male mice.
• Manipulated ventral pallidum (VP) activity through inhibition and activation.
• Employed viral tracing to identify VP projections to the primary visual cortex (V1).
• Administered meta-chlorophenylpiperazine (mCPP) to induce compulsive grooming.

Main Results:

• Self-grooming enhanced ocular-dominance plasticity in the adult primary visual cortex (V1).
• Ventral pallidum (VP) neurons activated during grooming; VP manipulation affected both grooming and plasticity.
• A direct GABAergic VP→V1 projection was identified, controlling V1 E/I balance and plasticity.
• Grooming intensity correlated with visual plasticity in a VP-dependent manner.

Conclusions:

• Identified the VP-V1 pathway as a critical circuit modulating visual cortical plasticity during grooming states.
• Demonstrated a direct link between behavioral state and sensory cortical function.
• Suggests a mechanism for how repetitive behaviors may influence sensory processing in neuropsychiatric disorders.