A shared ensemble in the prelimbic cortex links impulsivity and anxiety-like behavior.

Area of Science:

• Neuroscience
• Behavioral Science
• Psychiatry

Background:

• Mental health disorders exhibit overlapping behavioral and neural characteristics, but the underlying reasons and common neural processes remain unclear.
• Understanding shared neural mechanisms is crucial for explaining the comorbidity of psychiatric symptoms.

Purpose of the Study:

• To investigate whether prelimbic (PL) neural activity tracks behaviors unique to individual tasks or shared across multiple tasks.
• To identify shared neural ensembles in the PL cortex that may underlie common behavioral dimensions in mental health.

Main Methods:

• Endoscopic calcium imaging recorded prelimbic (PL) neural activity in rats performing tasks for impulsivity, distress tolerance, anxiety, incentive salience, and sensation-seeking.
• Behavioral and neural data were collected concurrently within individual animals to analyze shared activity patterns.
• Latent variable analysis identified shared behavioral structures and their neural correlates.

Main Results:

• PL neural activity significantly predicted most tested behaviors, except for locomotor activity.
• A shared neural structure comprising PL activity across four behaviors predicted a latent dimension of high impulsivity and low anxiety.
• A subset of PL neurons formed shared neural ensembles, with greater ensemble sharing correlating with a stronger link between high impulsivity and low anxiety.

Conclusions:

• A small, shared ensemble of PL neurons tracks multiple clinically relevant behaviors, predicting an approach/avoidance phenotype.
• These findings suggest a targetable neural population that may explain the frequent co-occurrence of diverse psychiatric symptoms.
• The study highlights the role of shared neural ensembles in the prelimbic cortex in integrating information across different behavioral domains.