Social hierarchy modulates cognitive flexibility through basal forebrain-prefrontal cholinergic projections

Area of Science:

• Neuroscience
• Behavioral Science
• Cognitive Science

Background:

• Social hierarchy is linked to cognitive flexibility, but the underlying mechanisms are unclear.
• Understanding this relationship is crucial for cognitive function research.

Purpose of the Study:

• To investigate the causal mechanisms linking social dominance and cognitive flexibility.
• To explore the role of cholinergic pathways in this relationship.

Main Methods:

• Compared cognitive flexibility in dominant and subordinate mice using Y-maze and Novel Object Recognition (NOR) tests.
• Measured acetylcholine (ACh) levels in the medial prefrontal cortex (mPFC) and neuronal activity in the horizontal diagonal band (HDB).
• Utilized chemogenetics to manipulate cholinergic neuron activity in subordinate mice.

Main Results:

• Dominant mice demonstrated superior cognitive flexibility compared to subordinate mice.
• Increased ACh levels and cholinergic neuron firing rates were observed in dominant mice's mPFC and HDB.
• Chemogenetic activation of cholinergic neurons in subordinate mice significantly improved their cognitive performance.

Conclusions:

• Social dominance positively influences cognitive flexibility via cholinergic pathways from the HDB to the mPFC.
• Cholinergic signaling is critical for cognitive function and may be a target for cognitive enhancement strategies.