Cholinergic Modulation of the Default Mode Like Network in Rats

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Systems Neuroscience

Background:

• The default mode network (DMN) is crucial for self-referential thought and is suppressed during attention-demanding tasks.
• The DMN shows an antagonistic relationship with attention networks, and its dysfunction is implicated in various neurological disorders.
• Cholinergic neuromodulation is a key regulator of attention and is hypothesized to influence DMN activity.

Purpose of the Study:

• To investigate the role of cholinergic neuromodulation in regulating the default mode network (DMN).
• To examine the effects of unilateral activation of basal forebrain cholinergic neurons on DMN activity.

Main Methods:

• Unilateral activation of right basal forebrain cholinergic neurons in a model system.
• Functional connectivity (FC) analysis of the default mode like network (DMLN) within and between hemispheres.

Main Results:

• Unilateral cholinergic activation led to decreased right intra-hemispheric functional connectivity within the DMLN.
• Interhemispheric functional connectivity of the DMLN was also reduced following unilateral cholinergic stimulation.
• Demonstrated differential effects of unilateral stimulation on brain network connectivity.

Conclusions:

• Cholinergic neuromodulation significantly influences the default mode like network (DMLN).
• Unilateral cholinergic stimulation can exert distinct effects on connectivity across brain hemispheres.
• Findings suggest potential for targeted cholinergic neuromodulation in treating DMN-related neurological conditions.